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Rinsing your sink can prevent food and other debris from drying and hardening onto the granite surface, and wiping it dry can protect your sink from any minerals that exist in your tap water.  Keep a microfiber towel or other soft cloth near your sink so that you can easily wipe it down after using it. The use of ioSeal-containing treatments can also be used for additional protection and enhancement. Granite is a porous stone, so the sooner you clean up a stain the better. Try to blot at a fresh stain rather than rubbing it so that you don’t spread it to a larger area. Clean alcohol and citrus spills immediately, since these can dull or etch the granite’s surface. After ensuring that your countertop has been initially sealed, be sure to follow up by using ioSeal-containing products for simple maintenance, or by re-sealing when necessary. How often you need to re-seal varies depending on factors such as color, porosity, and whether the sealant has been damaged by acidic products.  Optionally, with consistent use of ioSeal-based treatments, you can reduce the need to re-apply sealers.  Recommendations will vary.
Rinse and dry your granite sink completely after each use. Remove stains promptly. Apply ioSeal, or re-seal your granite sink when needed.