Get you a service manual online. Many can be downloaded online for free. See how to take to unit apart. Use electronic cleaner ( a can of CRC electronic cleaner bought at an auto parts store will do the trick ) to remove any bugs and things left inside the unit along with compressed air. Try to use an air compressor not a filled can of air they are not very powerful. Place the unit in a plastic storage bag or a trash bag and leave for 3-days sealed from air. Remove and enjoy.