The answer to 'how to clean drip edge' is to regularly clean and maintain the drip edge on your roof. The drip edge is the metal flashing installed along the edges of your roof that helps direct water away from the roof and prevent leaks. To clean the drip edge, you'll want to use a soft-bristle brush and a mild detergent solution to gently scrub away any dirt, debris, or buildup that has accumulated.
Be sure to work carefully and safely, especially if you need to access the drip edge from a ladder or roof. It's also a good idea to wear gloves to protect your hands. Once you've scrubbed the drip edge, rinse it thoroughly with clean water to remove any remaining soap or residue.