If you have waited to long and there's a buildup of soap scum and hard water residue, you may need to repeat a couple of times to get to the bottom of it, especially if the shower floor is made of...
Even though you can use a chemical cleaner to clean your shower tile, I have found that one of the best method for cleaning til and grout is to use a steam cleaner. Steam cleaners are much faster and...
honestly, you cant.. I had the same problem, went too fast and grout dried on. I had done some 1st time tiling in other tiles, and not done slate before. Once it's dried you knackered. you can try...