How to remove grout
My bathroom is about 10 years old and the handymen who did it really didn't do a good job. You can see from the picture. About half the grout is stained and part of the stained grout is on top of the tile. I have tried to clean it for years - tried everything but nothing removes the blackish stain. Its from minerals in my water. How can I remove this and regrout? I will only try to remove the floor grout as most of the wall tile and grout looks fine. I checked out some grouting tools - an electric regrouting tool from Hex Corp on Amazon and a drimmel tool. I need something more than elbow grease, LOL! Please help!