Before dismounting anything it is better to clean all the parts. Are you grounded? If yes, take an antistatic brush and dust off all that you can.

I use the brush combined with a low-powered vacuum that works through a DIY rubber tube with a sieve attached to its end. Using a vacuum cleaner could be dangerous because it produces quite an amount of static electricity. Other users prefer to use air cans or air compressors. Inform yourself about this matter and make your own choice.