good source for tile sealing info how to, and products used
how to seal grout lines so they don't get nastified
Sealing Grout Makes Cleaning Tile Floors Easier - Makely School for Girls
Grout Sealing Tutorial from YHL
How to remove tile haze, seal grout, and caulk tile seams
SEALING GROUT ~ Protect your hard work by learning how to seal grout and keep your kitchen backsplash looking new!
Hazy tiles from grout remains? Let Haze Remover do the work. No more buffing and scraping every last tile.