Low-powered hand-held leaf blower works the best. Try not to use a hair dryer, because there are various ones out there that work well, but also statically charge the air particles even if you're using the cold setting.
As for the paint brush, make sure it's sable hair, not synthetic. Synthetic bristles create static electricity, whereas sable (horse, real horse hair) works without any issues. Also, for those of you with chassis that rust, I suggest coating any new ones you get with some rust-proofing, especially in the USB ports.