This is probably heresy, but how can I remove the printed decoration on a brick? I managed to buy a large number of bricks with an eye decoration cheap and found that rubbing a long time with isopropanol removed the decoration but also scratched the surface. Is there a readily-available solvent that can dissolve decorations without needing rubbing, or otherwise damaging the brick?
Brasso (yes, the metal polish) works wonders as far as removing print. Yes, you still have to rub it, but it won't damage or scratch the surface and it works fast. Just use a soft cloth, pour some Brasso on it and wipe away the print.
Also, pure Eucalyptus Oil works really well. It requires a bit of soaking, but it will remove the print wonderfully and it smells good to - unlike Brasso. Saturate a piece of cotton in Eucalyptus Oil, place it on the printed surface, let it sit for a few minutes, then wipe away the print. It may require a bit of rubbing too, but usually not much.
Hope this helps!...(c;