Thats diluted for 1 RED DEVIL "Lye" drain cleaner you could do a 1/2 of a can to 1.5 gallon of water
you wont have to rub it on, just set it in there for 5 or 10 min. and rinse it off with water.
sandblasting with some really fine sand might be closer to what you looking for looking at your pic. |