Question: what is the best product to clean quartz countertops?
Answer: Regular cleaning should be done with a mild soap or detergent and a soft cloth. ... 
Although stain resistant, Quartz countertops are not stain proof. ... 
A glass or surface cleaner, such as Windex, can be used for heavy or dried on stains. ... 
Scrape away grease, gum, and paint with a plastic putty knife or razor blade.