So I got to the store and get a big sack of seed. The bag is pretty well sealed, as it is being used. But a few months down the line,the bag is FILLED with bugs. No doubt they came with the seed. Left alone, the bugs gradually turn the seed into dust. My question is, how can one treat a bag of birdseed to kill bugs? One option is freezing the seed, but it would take a lot of work to shuttle that much birdseed through the freezer. Another option is to throw some mothballs in the bag. No, the fumes they produce should not contaminate the seed. Once aired out, the seed should be pretty clean. A sledgehammer approach might be to put a cup of bleach in the bag, and then squirt in some acid. Then quickly seal up the bag for a week. Ba ba boom. Chlorine! Again, once aired out, the seed should be safe.