What Mike said!
I use (low pressure) compressed air to get loose dust out. Gun Scrubber on a Q-tip or pipe cleaner works quite well also.
BTW, do you check it with scale check weights EVERY SINGLE TIME that you use it? IMHO, the 30 seconds that it takes to use the check weights is good cheap insurance.
If you think a mighty military force is expensive, wait 'til you see what a weak one costs.