Ummm spinning the fan fast will not only damage them, but if they are pluged into any thing they can that over big time.
start off with a simple paint brush, the intel stock coolers have a habit of building up a layer of dust on top of them, that block the air flow from the fan.
PS is this it?
If so damb thats a messy load of cables
If that case is only 170mm wide you can forget any 120mm fan based tower coolers they will NOT fit.