Have 12" tiles with "Stained" light grout between the tiles and would like to repair.
The tile is on a cement slam and approx 150 sq feet - most of which the grout is stained.
1. Would bleach clean the grout? - Not my house and don't know the type of stain
2. Could I simply scrape some grout off the top and re-grout or must I remove most of
The grout?
3. Would the stains bleed through? I know it's difficult w/o knowing the stain type.
4. Would a Roto zip or dremel electric type tool work on the grout w/o chipping the tile?
Thank you