Selleys Muck-Off Graffiti Remover

What is Selleys Muck-Off Graffiti Remover, and where should you use it?

Selleys Muck-Off is a high strength cleaner formulated specifically for removing graffiti from a wide range of surfaces. It is suitable for removing water and oil-based paints from wood, stone, brick and painted surfaces, and it comes in a 500mL trigger spray bottle. Unlike a general paint stripper, it is a methylene chloride free and NMP free formulation, which is the reason it can be used where a conventional stripper cannot.

The thing to understand before you spray: Muck-Off cannot tell the difference between the graffiti and the paint underneath it. The manufacturer's note is explicit — it may remove paint, including Colorbond, beneath the graffiti. That is why every set of instructions for this product starts with testing a small, inconspicuous area.

Technical specification

Property	Typical result
Colour	Clear liquid with yellow tint
Density	1.03
Packaging	500mL bottle (trigger spray)
Clean up	Water
Formulation	Methylene chloride free, NMP free

These are indicative data from the product's technical data sheet, not intended for the preparation of specifications.

What the two methods actually mean

Selleys gives two different sets of directions, and choosing the wrong one is the most common way this job goes wrong. The difference is not the graffiti — it is what is underneath it.

On an unpainted surface (bare brick, stone, unfinished timber) there is nothing beneath the graffiti to protect, so you leave the product on until the graffiti begins to run and then scrub it with a stiff bristled brush moistened with more Muck-Off. Dwell time and agitation are both working for you.

On a painted surface the underlying coating is at risk from the same chemistry that is lifting the graffiti, so the instruction reverses: apply and wipe off immediately with a clean cloth moistened with Muck-Off. No dwell, no scrubbing. You repeat the short cycle as many times as it takes rather than leaving the product to work, because every extra second is also working on the paint you want to keep.

This is also why the test patch matters more here than on most products. A small, inconspicuous area tells you whether the substrate's own paint will survive the treatment before you find out across a whole fence panel.

Where to use it

Muck-Off is suitable for removing water and oil-based paints from:

• Wood
• Stone
• Brick
• Painted surfaces (with the caution above)

How to apply it

Read the label before use, and test a small area first.

1. Graffiti on unpainted surfaces: apply Muck-Off until the graffiti begins to run.
2. Scrub the surface with a stiff bristled brush moistened with Muck-Off.
3. Graffiti on painted surfaces: apply Muck-Off to the graffiti, then wipe it off immediately with a clean cloth moistened with Muck-Off.
4. Repeat if necessary.
5. Rinse off with water.

Limitations — what Muck-Off will not do

• Some graffiti penetrates the surface and can only be removed by abrasive blasting. Porous, unsealed masonry is where this happens — the pigment is inside the substrate, not sitting on it, and no chemical applied to the face will reach it.
• Muck-Off may remove paint, including Colorbond, beneath the graffiti. Test a small area prior to use.

If a test patch shows the underlying paint lifting, the honest position is that removing the graffiti will mean recoating that surface afterwards. That is a decision worth making before you start, not halfway along a wall.

Clean up and storage

Clean up is with water — rinse the treated area off with water once the graffiti has been removed. Store the bottle in a well ventilated place and keep it cool.

Warnings, first aid and shipping information are on the product's Safety Data Sheet, available through the Selleys website.

Hazard classification

Classified as hazardous under Safe Work Australia GHS 7, with the signal word Warning.

• Eye irritation — Category 2A. H319: causes serious eye irritation.
• Combustible liquid. H227: combustible liquid.

Not classified as Dangerous Goods by the criteria of the Australian Code for the Transport of Dangerous Goods by Road & Rail, New Zealand NZS 5433, the IMDG Code for sea transport, or the IATA Dangerous Goods Regulations for air transport. In New Zealand it sits under HSNO Group Standard HSR002525 — Cleaning Products (Combustible).

What is in it

Chemical entity	CAS number	Proportion (w/w)
Dimethyl sulfoxide (DMSO)	67-68-5	10–30%
Dodecanoic acid, methyl ester (methyl laurate)	111-82-0	10–30%
Ethyl 3-ethoxypropionate	763-69-9	10–30%
Methanol	67-56-1	<1%
Non-hazardous or below reporting limits	—	Balance

That table is the whole explanation of this product. The page above describes it as a methylene chloride free and NMP free formulation, and the three solvents doing the work here — DMSO, methyl laurate and ethyl 3-ethoxypropionate — are what replaced them. They are the reason Muck-Off can be used where a conventional stripper cannot. They are also why a product with no chlorinated solvent in it still strips paint: the solvent power is real, which is exactly why the page warns that it may take the Colorbond off underneath the graffiti.

The combustible liquid classification is the one most likely to be overlooked, because nothing about a trigger spray bottle suggests it. A combustible liquid is not a flammable one — it does not ignite at room temperature the way petrol or an aerosol propellant does, which is why the product is not dangerous goods for transport. But it will burn if heated, and the label carries P210: keep away from heat, sparks, open flames and hot surfaces — no smoking. In practice that means the obvious things: not while someone is welding or grinding on the other side of the fence, not on a hot metal surface in the sun, and not with a cigarette going. It is also why the storage advice already on this page — a well ventilated place, kept cool — is on the label as P403+P235 rather than being generic good housekeeping.

Eye irritation is a Category 2A hazard, and the format of the product is what makes it likely. This is a 500 mL trigger spray used on vertical surfaces, often above head height on a wall or a fence. Spray directed at a hard vertical surface rebounds, and the fine mist drifts back with whatever breeze there is. That is why the safety data sheet specifies chemical goggles for handling it rather than the safety glasses that most Selleys products call for — a detail worth respecting, because safety glasses do nothing about a mist that arrives from the side.

On skin, wear the gloves. DMSO at up to thirty percent is a solvent with a well-documented ability to carry dissolved substances through intact skin — that is a property of its chemical class rather than a statement from this safety data sheet, so treat it as the reason to be careful rather than as a sourced hazard. It is a sound argument against letting the spray run down an ungloved forearm while you work above your head, regardless of how mild the product's own classification is.

Protection

• Chemical goggles — not just safety glasses, given the trigger spray and overhead work.
• Gloves — nitrile rubber is suitable for intermittent contact. Selleys notes that glove construction and local conditions vary, so the final assessment is the user's.
• Overalls and safety shoes.
• Ventilation — natural ventilation is adequate under normal use conditions. No occupational exposure limit has been assigned for this material by Safe Work Australia, and its ingredients have no biological limit allocated.
• Keep away from heat, sparks, open flames and hot surfaces, and do not smoke while using it (P210).
• Wash hands, face and all exposed skin thoroughly after handling (P264), and wash contaminated clothing and protective equipment before storing or reusing it.

First aid

Exposure	What to do
Eyes	Rinse cautiously with water for several minutes, removing contact lenses if present and easy to do, then keep rinsing (P305+P351+P338). If eye irritation persists, get medical advice or attention (P337+P313).
Skin or hair	Remove contaminated clothing and flush the skin and hair with running water. For gross contamination, drench immediately with water and remove clothing, then keep flushing with plenty of water and soap. For skin burns, cover with a clean dry dressing until medical help arrives — if blistering occurs, do not break the blisters. If swelling, redness, blistering or irritation occurs, seek medical assistance.
Inhalation	Move the person away from the exposure without putting yourself at risk. Remove contaminated clothing, loosen the rest, let them rest comfortably and keep them warm until fully recovered. Seek medical advice if effects persist.
Swallowed	Rinse the mouth with water. Do not induce vomiting. Give a glass of water to drink. Give nothing by mouth to an unconscious person. If vomiting occurs, give more water and seek medical advice.

Store in a well-ventilated place and keep it cool (P403+P235), and keep it out of reach of children (P102). Dispose of contents and container in accordance with local, regional, national and international regulations (P501).

If poisoning occurs, contact a doctor or the Poisons Information Centre — 131 126 in Australia, 0800 764 766 in New Zealand — with the container to hand. Selleys emergency line: 1800 220 770 in Australia, 0800 220 770 in New Zealand.

Common questions about Selleys Muck-Off Graffiti Remover

Will it damage the paint underneath the graffiti?

It may. Muck-Off may remove paint, including Colorbond, beneath the graffiti. Test a small, inconspicuous area before you treat the whole surface.

How is it different from using a paint stripper?

It is a methylene chloride free and NMP free formulation, described by Selleys as a safer usage formulation, and it comes as a trigger spray rather than a bodied brush-on stripper.

How long do I leave it on?

That depends on the surface. On unpainted surfaces, until the graffiti begins to run, then scrub. On painted surfaces, wipe it off immediately rather than letting it dwell.

What if one application does not remove it?

Repeat if necessary, then rinse off with water.

Do I need a brush?

On unpainted surfaces, yes — a stiff bristled brush moistened with Muck-Off. On painted surfaces use a clean cloth moistened with Muck-Off instead, and wipe rather than scrub.

What surfaces is it suitable for?

It is suitable for removing water and oil-based paints from wood, stone, brick and painted surfaces.

Why will it not shift some graffiti at all?

Some graffiti penetrates the surface. Where that has happened it can only be removed by abrasive blasting.

How do I clean up afterwards?

Rinse the surface off with water.

What size does it come in?

A 500mL bottle with a trigger spray.

How should I store it?

In a well ventilated place, kept cool.

Should I test it first even on bare brick?

Yes. The manufacturer's instruction to test a small area prior to use is not restricted to painted surfaces.

For stripping a paint or varnish film rather than removing graffiti, see Selleys Kwik Strip. The full paint removal range is also worth a look if you are unsure which product suits the surface.