Specially designed and formulated for use on natural stone surfaces, Rock Doctor granite and quartz cleaner removes grime and some stains from your countertops, vanities and other surfaces without streaking or residue, leaving behind nothing but a clean, fresh scent. Rock Doctor granite and quartz cleaner is specially formulated for use on all sealed natural and cultured stone surfaces. Natural stone surfaces should be sealed before use or before any cleaner is applied. Rock Doctor granite and quartz cleaner is also safe for use on sealed grout. Your granite or stone surfaces should be sealed when they are installed. If they're not, use granite and stone sealer to ensure proper protection of your natural stone counters. To keep your stone surfaces looking their best, follow up with our quick drying granite and quartz polish. But, here are a few helpful tips that can make keeping your stone surfaces looking and performing like new even easier.