Remove and clean knobs with a non-abrasive cleaner. This will help to preserve the stenciling on the knob. Replace any broken, or illegible knobs to make your cooktop look new again.
You can clean any porcelain stovetop or glass range/oven control panel with a non-abrasive cleanser or glass cleaner. Watch out for some “cream type” cleansers as they often have tiny abrasive particles in them, which can damage your stovetop or control panel.
Drip pans and bowls serve multiple functions for a range. They serve to catch food and spills, they also help radiate heat back at the pan for better efficiency, and they protect you from accidentally touching internal components. It’s important never to cover them with aluminum foil. Many electric cooktop short out due to the aluminum making a short circuit at the burner. And, the foil will cover the oven vent usually found at one of the burners. Try to clean the drip pans with a household non-abrasive cleanser. If they cannot be cleaned, you can replace them.