You know, it's obvious many responders did not bother to read beyond the original post before they answered with their own thoughts, could have saved themselves and others some time. It's just a courtesy to do this.
Many had great suggestions, and it's been good fun to find out that BIRD SEED was the cause of this unique problem!! Whodda thunk it?!
Bet that particular one won't be a problem for most of us.
Jan in VA