For Grout Cleaning with Porcelain or Ceramic tile ONLY! Tile Mix 7 cups water, cup baking soda, cup lemon juice and cup vinegar. Spray the concoction onto the dirty grout, let sit, and scrub with a brush.
Could do this to all my beach rocks too to return them to the amazing colors that they are when the waves wash over them! Spray sea shells with Painter's Touch Gloss in Crystal Clear to return the beautiful natural color and pattern to the shells