We had ceramic tile installed in our kitchen and I would just mop it with whatever. The last few years used Pine-sol. Well One day I realized the grout was pretty gross. Found out that sponge mops and an oil based cleaner are the worst things for tile and grout. The cleaner leaves an oily residue that the sponge mop pushes into the grout lines. So i've been scrubbing the grout with whatever I can get my hands on. My knees can't take much of that so I still haven't gotten it all up. Mr.Clean Magic Eraser, The purple Awesome which is for ceramic floors, Soft Scrub and a special grout cleaner. It still takes a lot of elbow grease- runs out real quick. LOL