Hi.  I use the "canned air" they sell at office supply stores to clean keyboards.  You need to be careful, because its actually a liquid and if you get it too close to the boat it gets a little wet.  Not a huge problem, but use it in short bursts as opposed to holding the trigger down for a long time.  The cans also get VERY cold as you use it.  I usually keep several in my shop so I can switch them out as they get cold.  You can also use a pin if you have a lot of time.  Good luck!