Regular maintenance cleaning for granite countertops. I would do this daily, or after using the kitchen.
Pre clean area. Remove excess crumbs and debris. Wipe up any stains. With granite it's said to always wipe up stains immediately.
Use a cleaning solution of 3 parts mild dish detergent to 1 part rubbing alcohol. Add to very warm water. No citrus dish detergents. Never use ammonia, vinegar or citrus cleaners on granite.
First use a clean white soft cloth. I use never used diapers. They are soft and clean well.
After that use a microfiber cloth to buff out streaks.