@bellahomes220
Laticrete, Stone Tech products.
Sealer - Impregnator Pro (solvent based) will not darken the natural stone. Apply 2 generous coats and you will not have to seal again for another 5-7 yrs.
Cleaner - Mold/Mildew remover and/or Soap scum remover. Spray and walk away. These products do not harm the natural stone or sealer. Doesn't get much easier than that.
PS - Your tile installers are incorrect about the sealer.
Q
Rails
Q