>What I found that works well for me was drilling a small hole in my smoker so I can attach my Weller Pyropen (WPA2). Now the oxalic acid is sublimed in the smoker and I can just puff it when and where I want to (within reason)

Is that not very dangerous?  You must be breathing in oxalic fumes?

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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