This is what I've done for years:
- get a Styrofoam cup and poke a small hole in the bottom
- put a drinking straw about halfway through the hole (should be snug)
- put the nozzle of your vacuum cleaner into the inside of the cup, so that the straw goes up the nozzle
- use the straw on the outside of the cup to carefully vacuum dust out of those tricky areas. The flow is much more controlled and accurate
I've never ever had a problem. In fact, I don't use compressed air around components, because they spray condensation
Hope that helps.