Definitely agree, both because of the 90% and the pattern of rust….not from hands. I’m not particularly knowledgable about building construction, but if you are in a shed, basement, garage, etc., I’m wondering if you have adequate surface drainage around the building? Or, do you have standing water after storms that does not run off, thus leading to more moisture indoors? Of course, some places just have damp soil all the time and some places have humid air, but thought I’d ask. If this is a drainage thing, some time with rake and shovel fixing the grading might help a lot. When I moved into my house, I had water on the floor after big storms until I fixed the grading, after which it has never been wet again.

• This reply was modified 3 weeks, 3 days ago by Ed.