I can't remember what thread it was, but someone was talking about rigging up a lawn sprinkler to soak door checkers. Well here is one that is marketed to repel animals from your garden. But it could be used to wet door checkers.
Now I have not purchased this and am not recommending this. Just pointing out that it exists.
https://inovostore.com/products/spraycrow?fbclid=IwAR3TPnOAF5_cLqmu-p1arPdnhSjXfNZtGiCiHVJQRRcWKDF0qH-uilYlmW4
Now I have not purchased this and am not recommending this. Just pointing out that it exists.
https://inovostore.com/products/spraycrow?fbclid=IwAR3TPnOAF5_cLqmu-p1arPdnhSjXfNZtGiCiHVJQRRcWKDF0qH-uilYlmW4