Little white bugs

Came home from vacation and my mouse tubs and rat racks are covered in these little white bugs. Any advice how to get rid of these things?

Are they lice? if so looks like your in for some hard work.
Can you post a pic?
They could be harmless gnats too.
Do they fly?
I know you can use frontline on mice but then cant use them as feeders. Treating feeders could be tricky I hope someone else can help you.

Sounds like grain mites. Are they REALLY tiny, just white dots that look like dust?

I just spray my cages down with walgreens brand lice bedding spray, and they pretty much go away. They're harmless, just ugly.