I feel your pain. It has taken so long to eliminate these little monsters. My buttons are in my house, so seeing these things crawling out of the enclosures and on my walls, objects, etc sent me over the edge. It was millions of them. I had no idea. I just thought it was dust.
I cleaned, washed...
There's really nothing you can do.
I go to southern states and tsc and they are everywhere. I have told them multiple times and nothing is done about it.
Just wipe the bag down with cleaner. Or do what I do, freeze the bag to kill any mites.
Also you can toss some DE in the food, it does work...