Do not know if this will be of any help to you,but it works for us.We
have a spray glue that I came across on good ole ebay.It is used on the
corners of the coop,at the ends of perches,on the end of the wood because
they like to hide in there.On the bottoms of the nest trays ( they still like
plastic ) and round the rims.All round the door frames and shutter.Now we
have used the glue to stick polythene to the inside of the roof.You can see them
but they cannot get through,should they try they remain stuck.We did use
grease at one time but it goes off,the glue never seems to dry,just remains
tacky all of the time.Does not bother the birds either.This week-end because
the coop is on stilts,we will spray all of the underneath.
It's got to be worth a try.
Good luck and welcome.

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