i had my floor tiled a few years ago...they had used black grout between white tile and put my island back...just had island moved and there are black stains on the white tiles...can they come out...and how???
Try some straight bleach. Be sure to ventilate the room well as bleach is strong...
Dilute clorox bleach into a spray bottle (3 part water to 1` part bleach) and spray it on the grout. Wait 5 minutes and rinse. Cheap and effective.
Greetings.. If this is an intentional black grout used between the tiles.. as you say, then your work is cut out.... hope it is just dirt. But, assuming the worse, keep in mind that grout is designed to stick mainly to the unglazed sides of the tiles. So... You can use a razor blade scraper tool -- this tool holds a one sided straight razor blade. You then can slide the blade along the tile at an acute angle (near parallel) and scrape off the grout ( like cleaning a cookie sheet with bad carbon build up). Change blades often for big jobs. Then use the Teflon scrubber pad, soap and water - and - some elbow grease for finishing. Think twice about the bleach...test it on a small unseen area first - it may have nasty staining possibilities on the black grout you Want to see..
if the stain is on the tile .. dont use anything rough like a wire scouring pad.. its bad it will scatch your tile.. if you want to get the stain out use a soft non scratching sponge with the green pad on the back .. pour some bleach on it.. or use a cream cleaner eg.. vim with bleach already in it .. sprinkle it all around the stained area.. and scrub and whip the stain away .. trust me it works and its not so bad smelling as using pour bleach.. .. and this method is assume on bathroom tiles around the toilet and the shower too .. leaves a nice clean fresh smell in the room ..
