The clean reflective surface is facing the air bubble, so it stays pretty clean. The reflective surface does deteriorate on the outside of bubble foil with use though. This is especially true with the reflective surface on SOL space blankets, it rubs right off, and they will be certainly be less effective as it does.

Heather, you should make one of those tents for grins (and you have so much spare time ). Seriously though, I think you'd have a blast playing with one up there with on your property.