I have ‘hard’, mineral-laced well water.. so I was excited to try Tub and Tile, my first order (currently 2 months in). What a difference it made on our shower, the first application! I can’t wait to try it in the wash, as hard water is difficult on your whites (and you’re not supposed to use bleach in hard water) And NOW I’ve learned that they keep back ants (other insects, perhaps). The real test was taking the staining off our fiberglass sailboat (in the diluted strength) Smells wonderful too…. a versitile, great product!