Just wondering if anyone has tried these? I have chicks in arks and growers in pens in an old ,beamed , oak framed barn. ArkS and pen frames are fine to treat but I should probably treat the barn some how.No way could I treat it efficiently with topical stuff and thought it might be worth using some of the Fumers (I have not seen any on the barn wood but -I bet they are there somewhere!). Just wondered if anyone has found they work! Ros