Peggy: full-time shift-working mama to Kiddo (Nov|04) and Babygirl (May|11). Fiancée to Babe. Step-mom to Tween, my bonus daughter (Sep|00). Currently TTC - http://www.fertilityfriend.com/home/3c1739
Get some oxygen bleach. OxiClean is readily available. Mix the OxiClean with some hot water in the sprayer, but don't fill the water up all the way. The mix will cause some gas and you don't want the bottle to burst (like a coke can). I usually fill 1/2 to 3/4 full. I let the bottle air out for a few minutes and then I put the nozzle on and spray the tile and grout. It's really, really awesome.
Oxygen bleach is not real bleach and it uses a hydrogen reaction to blast away stains. Because the pH is high (like borax or things that can clean very well), wear gloves when you use the product and keep the powder away from children or pets (do not ingest).
Diluted white vinegar works to a degree, but it starts eating away at the glazing and it totally eats away at grout, so I don't really recommend using that. I switched over to OxiClean when my grout started falling out of my tile, heheheh.
It just mixes better and you can target all the tiles without using too much or throwing a bucket full of the solution. It does all the work for you really. I use a big square broom to scrub my tiles afterward. I have a bad back and I'm short and there's no way that I would get into the garden tub I have and scrub the tiles from top to bottom. The long handle works nicely for that.
It's a pain at times when I'm in a hurry. But I have not seen any mold since we started doing this.
Michelle , 20+ years with a wonderful DH
Mama to two boys, 12 and 10
I had a big bottle of the Wal-Mart generic version, and decided I'd sacrifice some in the interest of science (or maybe it was laziness.) Anyway, I wet a rag thoroughly and slopped it on, re-wetting the cloth as needed (this was a microcloth.) While each small wall was still very wet, I quickly scrubbed the whole surface down with a large cleaning brush. I didn't have to scrub hard. I could feel the surface tension releasing, and knew it was as clean as it was going to get. Well, guess what? It smelled great and was nice and clean. I used some Barkeepers Friend on the shower floor, and was happily done! YMMV, but it worked for me!
So when I use straight up vinegar on my (old, totally not fancy) kitchen counters is that too strong?
Can't wait to try my oxo-brite on the tiles now. If it works it might actually be fun. I've only used it in laundry- never for cleaning.