Super Nova is a concentrated heavy duty alkaline cleaner and restorer for deep cleaning of heavily soiled tile and grout. Safe for use on all polished surfaces. Super Nova is unmatched in it's ability to clean and restore stone and grout to it's original color. This non acid formula is safe to use on natural stone and will not etch the surface of the stone. An Alkaline based product is the first step in removing greases, oils and any sealers on stone and grout surfaces. USE ON: Safe for all stone surfaces. Always test a small area to check for desired outcome.