Quartz stone countertops composed of 93% quartz volume and some resins makes the surface is non-porous, which is hard for bacteria to hide, the quartz surface is resistant to stains, but not stain proof. However, quartz countertops are still in lower-maintenance and easier upkeep than other kinds of stone countertops.
First of all, you should get the basic cleaning up for the quartz countertops. Daily maintenance would be nice. You can do the job with a clean cloth and soapy water. If the surface requires deeper cleaning, you can spay a multi-surface cleaner on the surface and let it sit for a time, then wipe it with wet cloth, paper towel or non-abrasive sponge.
Different manufacturers and suppliers may have different cleaners special for the surface countertops, while you can just ask for the manufacturer.
Importantly, you should keep the permanent marker away from the quartz countertops. If you find it, first clean the area with soap and water, and then you can use the oil-based stain remover, do it carefully. Rinse the area with clean water and pat dry.
Also, if there are cooking grease on the quartz surface, you should wipe it right now, and spay the countertop with kitchen degreasing products if the cooking grease has settled on the surface, finally wash the surface with clean water.
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