Like a lot of audio equipment, receivers can be sensitive to harsh chemicals and can get damaged when cleaned improperly. The best way to tidy up your receiver is using a can of compressed air to dispel dust on the surface and in the cavities, especially useful if you open up the chassis. It's also advisable to occasionally remove the knobs, faceplate, or switches, and clean any point of contact with contact cleaner, which is specially designed for cleaning electronics.