I have a bathroom tiled with granite tile floor and walls. the granite is sealed with xypex (seems to be still well sealed) and is a salt and pepper quartzite granite. (see pic)
one of the tiles has a dark stain on the surface about 6 ft up and to the right of the toilet, exactly where you might put your hand if you were urinating into the toilet. so I am assuming its mostly just natural oil from someone's hand, but there may be other gunk in there (ewwwwwww). anyhow, I have removed lots of stains from granite and stone on horizontal applications (acetone and/or poultices) but this ones awkward. poultices wont stay in place, acetone runs off before it has a chance to work. tried brake cleaner and various degreasers, all to no avail. I made some progress just standing there spraying and wiping acetone, over and over again, but its too inefficient. I also tried spraying acetone on a sponge (which it attacked) and taping it up under some plastic film (the acetone dissolved the tape glue) but it didn't work. anyone have any ideas?