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Old 06-14-2011, 06:00 PM
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How to clean graffiti off of brick?

Would a power washer clean spray paint off of a brick house? If not, how would you do it?
Old 06-14-2011, 06:21 PM
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You can try. It might work. Normally they sand blast it.
Old 06-14-2011, 06:24 PM
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Try something like this.
Brick is very hard to remove graffiti from, because it’s porous. Even if the remover and power washer works, you are likely to have “ghosting,” so don’t expect perfect results.
Old 06-14-2011, 07:03 PM
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I used to use a car engine degreaser called Gunk to get spray paint off of cement.
Old 06-14-2011, 11:48 PM
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Quote:
Originally Posted by Harmonious Discord View Post
You can try. It might work. Normally they sand blast it.
Ah so sand blasting would be the way. You can rent those, right? (This is all hypothetical btw, my house is fine)
Old 06-14-2011, 11:54 PM
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Originally Posted by OpalCat View Post
Ah so sand blasting would be the way. You can rent those, right? (This is all hypothetical btw, my house is fine)
You need to be very careful when sandblasting brick - if you use too-agressive abrasive, you can seriously erode the brick, which looks bad. I donít think that sandblasting is a novice DIY project. Try the chemicals and power washer first.
Old 06-14-2011, 11:54 PM
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I have a vague memory that you're not supposed to powerspray brick as you'll force water between the mortar and brick or into the porous brick or something like that. But I could be mis-remembering. If this weren't a hypothetical, you'd be well off to check with an expert.

Last edited by needscoffee; 06-14-2011 at 11:55 PM.
Old 06-15-2011, 09:09 AM
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On another site I was once asked how to remove graffiti from rocks without killing the moss. I suggested liquid cooking oil. It was quite successful earningme the most positive feedback of anything I ever posted to the net. Yes, moss huggers.
Old 06-15-2011, 11:43 AM
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Originally Posted by beowulff View Post
You need to be very careful when sandblasting brick - if you use too-agressive abrasive, you can seriously erode the brick, which looks bad. I donít think that sandblasting is a novice DIY project. Try the chemicals and power washer first.
I think professional conservators use something other than sand for this type of sandblasting. I've heard of ground walnut shells and ice pellets being used.
Old 06-15-2011, 04:46 PM
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Originally Posted by OpalCat View Post
Ah so sand blasting would be the way. You can rent those, right? (This is all hypothetical btw, my house is fine)
Yes, you can rent one of those. You will need to purchase the sand though.
Old 06-15-2011, 06:46 PM
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Good detail to know, thanks Omar.
Old 06-15-2011, 09:44 PM
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I used a wire wheel on a drill to take paint off of rock. Basically the same thing as sand blasting. Both are going to abrade the surface.
Old 06-16-2011, 01:31 AM
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Back in the day, I participated in an effort to remove graffiti from some Native American petroglyphs. We used copious amount of Easy OffTM oven spray and washed it off with water from a fire hose. Worked like a charm.
Old 06-16-2011, 04:01 AM
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Sandblasting is not a clean process. Pretty nasty. You'll end up with a beach by the time you're done. And you have to have adequate protection for your lungs and your body. Professionals used supplied air, I've used one with a good filtration (painting mask) which is still taking a bit of a chance
Old 06-16-2011, 08:14 AM
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Originally Posted by Deereman View Post
Sandblasting is not a clean process. Pretty nasty. You'll end up with a beach by the time you're done. And you have to have adequate protection for your lungs and your body. Professionals used supplied air, I've used one with a good filtration (painting mask) which is still taking a bit of a chance
We've gotten completely way from open-cycle sand-blasting for our equipment. For open cycle blasting, we've switched to a Cold-Jet machine, which not only works better then sandblasting, but has virtually no cleanup.
Old 03-19-2012, 04:29 PM
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Graffiti on brick

Would a oven cleaner work ?
Old 03-19-2012, 05:07 PM
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I've used Goof Off successfully many times. They even have a section on brick.

I'll second the notion that sandblasting brick will likely damage the brick
Old 03-19-2012, 05:11 PM
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Quote:
Originally Posted by Sal Ammoniac View Post
I think professional conservators use something other than sand for this type of sandblasting. I've heard of ground walnut shells and ice pellets being used.
And corn husks.
Old 03-19-2012, 05:41 PM
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Originally Posted by Jimmyfizzy View Post
Would a oven cleaner work ?
zombie or no

that is a chemical that has to be used carefully and properly. it is made for a specific application and might be safe when used for that purpose. it is corrosive to bodies and clothing, it may be had to use it safely when attempting to use it for other purposes.
Old 03-19-2012, 10:47 PM
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Originally Posted by Jimmyfizzy View Post
Would a oven cleaner work ?
Check the label. I think the active ingredient is lye. Lye is highly effective on paint held together by ester linkages. It may not do much on newer paints with acrylic and styrene backbones.
Old 03-19-2012, 11:35 PM
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Graffiti Blasters in Chicago uses a high pressure baking soda mixture on unpainted brick.
Old 03-20-2012, 09:27 PM
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don't they clean excess mortar off brick with acid?
dunno...maybe it works.
Old 03-21-2012, 04:14 AM
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Originally Posted by raindog View Post
I've used Goof Off successfully many times. They even have a section on brick.

I'll second the notion that sandblasting brick will likely damage the brick
Agreed. When I worked at BellSouth our crossboxes would constantly get vandalized by some thug and his spray can. We carried Goof Off (or something very similiar), sprayed it on and it dissolved the paint in a few minutes. It turned it into a liquid that could be washed of very easily. Somehow it never seemed to bother the paint that the crossbox was painted in. I never used it on brick, but I would bet that a good coating of it followed up by a low pressure spray of water would do the trick.
Old 03-21-2012, 06:04 PM
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So OpalCat, what did you end up doing?
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