I'm not trying to blow up the plane

Ok so it's happened a few times that when I go through security, my bags set off an alarm saying that it detects explosive materials. When this alarm goes off they have to do a complete pat down and bag search, special tests, and then re-run the bag in x-ray machine. Complete bag search entails them emptying the entire contents of my suitcase onto a table in the middle of airport security. It's happened a couple times, this time in Boston Logan airport on my way to Russia. I am not a terrorist!! I think I'm going to have to hose down all my luggage and clothes so it stops happening!