Answer:
Very carefully. Quartz can not be top polished except by a handful of experts using special techniques. The going rate is $1,000 plus travel time and costs.
Try using a single edge razor blade laid almost flat, gently rubbing and scraping. If you try a product like Lime Away, be sure and test a scrap first to be sure it won't etch the qaurtz.
It is advisable not to use acid cleaners on countertops. The top surface can be gradually dissolved by acids and expose the layer underneath and cause a lot of damage.
Natural Formula to Use:
A mixture of baking soda and warm water
Method to Use:
1.Make up the mixture of water and baking soda
2.Scrub stains with a soft brush or sponge
3.Rinse thoroughly with water to remove all residue
Tip:
When scrubbing the stains be careful to rub gently as once the surface has been scratched it easily picks up any grease, dirt or soap residue.