Is it possible to remove painted graffiti from granite boulders?

Soy based paint remover should do the trick. it is non toxic. http://www.thenaturalabode.com/mm5/merchant.mvc?Screen=PROD&Product_Code=9061&Category_Code=liquids&Store_Code=TNA&gclid=CMmjibrvirsCFWQOOgodOzoAig

I got it off a block wall with muriatic acid once. Dangerous stuff but it worked.

A sander?

Any possible way to get a sand blaster to them? That was the first idea that popped into my head.

Oven cleaner. But on a rock which is porous a sand blaster might be best. I got it off an old, porous wood fence with oven cleaner.

Hey, in 50,000 years, archaeologists might see that painting and want to study it further.

Hmmm…interesting answers. Sandblaster ey? I don’t think I could get a sand blaster down into this rugged canyon very easily. I wish I could just hire someone to do the good deed.

@Seek_Kolinahr Perhaps, but it sure is a fugly sight right now. Pisses me off to no end when people mess with mother nature. Grrr.
The chemicals are interesting but I wouldn’t want any of them to leech into the river. Dilemmas, dilemmas.

You can buy stripper in a spray can that will eat nearly anything, but how would you get water to rinse any of this off? Granite is strong stuff…a blow torch might burn it off.

Fortunately, granite is not porous, so any part exposed to the weather should wear and fade away with time. I once had graffiti on a brick house and finally had to resort to having Sherman Williams spectrograph a spare brick and mix paint to match. I waited until I went to sell the house because I hated the pious, wife-beating, holier than thou neighbor. The paint was on the side of my house that faced his back yard and said, in large letters, “FORK A BIRCH”...er…or something much like that. It limited the time they spent in their back yard. lol

I’ve used a Mr. Clean Magic Eraser to remove paint from stone.

If you do use a chemical solvent, be careful; it will leach into the environment and may cause damage. It might be better to just paint over the graffiti with something that matches the colour of the stone.

If this is on parkland (city, state, federal), be aware that you may be breaking the law by bringing harsh chemicals into the park.b the cure may be more damaging than the disease.

Usually the right thinner and wired brush will work or may be you can try Elephant Snot®.

@downtide
@elbanditoroso

Yes, my concerns too. Any toxic residue would wash into the river and leech into the ground, also the regulations, not sure about the lands jurisdiction, maybe I will just talk to a ranger at the nearby state park.

Heck, try splashing a little vinegar on one, and see if it hastens the fade.

Can you get some sort of vehicle to the site? If so, you could get some sort of sand blaster or something. Something with a gas engine would probably work, if there is such a thing.

@snowberry
Hiking down to them and finding a way to secure a ladder to attempt to clean them would be very high risk, no vehicle access, rocky ground, whoever painted them must have stood on adjacent huge rocks to reach them. Just so ugly, I can’t believe people would scar the landscape like this in such a beautiful mountain area. Pffft!