Wrong Sealant used on Unfinished Ceramic Tile... how to remove?!
They sell sealant cleaners that you're suppose to be able to use when you are preparing a tiled surface for re-sealing. But they sometimes take a long time and lots of elbow grease, too. . . and they stink to high heaven and require strong ventilation and aren't always effective. (Oh, and the effective ones are really expensive).
I've also heard of a product called 'Oil Eater' being used to prep grout for sealing. Not that it really removes old sealant - but it cleans the surface so new sealant can be applied.
At this present moment in time I am making cabinets for the kitchen - just in case you wanted to know what I'm doing when I'm not around.