Yes, I do some pre-vacuum pack cleaning. Like I do when I dry morels, I never rinse them I just make sure no loose debris is present. But I revisit that when I thaw them, if they require scrubbing out embedded dirt specks it's better done post freezing. The pre-freeze before vacuum packing doesn't seem to be necessary for me, so far. I never had any issue with burn unless a bag got ruptured jostling stuff around in the freezer. I separate and then overnight them in the fridge in a large container with a paper towel in there and moisture usually isn't an issue, and these I just cleaned weren't as wet as I thought they'd be. Good info though, I love to share the ideas. What counts is are you getting what you want from your harvest. More to come for sure! EDIT: Sometimes, I put another seal on the bag when I see moisture creeping up, but that is usually just on fish.