A bit of moisture actually helps to reduce the chance of static discharge, shop compressed air is probably one of the better ways of doing this. I've done it for many years like that and never had a computer fail on me due to cleaning.
The best thing is to avoid doing this on cold winter days when static build-up is very rapid, and to avoid touching the guts of the computer with your fingertips near the circuitry until you have grounded the case against your fingers. Easy enough with metal frames, much harder with plastic ones.
The best thing is to avoid doing this on cold winter days when static build-up is very rapid, and to avoid touching the guts of the computer with your fingertips near the circuitry until you have grounded the case against your fingers. Easy enough with metal frames, much harder with plastic ones.