I believe residue is just from big cloud VG. I certainly don't see any around my flat, if there's any it must be slower to build up than dust. If the impact is

I believe residue is just from big cloud VG. I certainly don't see any around my flat, if there's any it must be slower to build up than dust. If the impact is big enough sure, but it makes little sense to me to treat them harsher than anything else.