I’m looking for some help trying to get some public restrooms clean. I’ve cleaned them for many years with many different products and had very limited success. They hardly clean up at all. Recently, I tried a small area on the tile with a hard water stain remover called Bio-Clean. It was a miraculous difference., both tile and grout. Unfortunately, the stuff is like $30/bottle (there’s 16 bathrooms) and is a lotion like consistency making it impossible to apply economically. Do any of you pro tile cleaners know a product that might work in my situation? I feel like I’ve tried just about everything I’ve found and nothing had worked except this one weird, super expensive product. What do you guys use for very stubborn bathroom tile and grout?