It can be difficult to remove stains that have existed for a long time. The best way to fix this is to use a solvent cleaner, such as an adhesive remover or something similar. The best time to use cleaners such as adhesive remover or degreaser above is when the countertop is still wet. It will make the solvent easier to use and will be evenly distributed on the countertop.
Unlike other kitchen countertops, a quartz countertop may need more than warm water and soap to ensure its safety when preparing meals.