[nicky d]

Grannies right they can live longer than 3mths without feeding.    Im sure im right in saying that creosote is banned now so they stuff selling in B and Q is probably not the powerful strong stuff, you would be probably wasting your time using the more diluted version.   Gary just stick to what your doing, you will get on top of it, get some poultry shield, paint a slurry of diatom in the inside of your coop and just keep repeating, you will get there and definately dont hose them out, they will just crawl back in again.   nickyx

[Yorkie]

Yes, Nickyd, you're right about creosote.  It's been banned for some time now for amateur use completely and can only be used by licensed professionals in limited specific circumstances, as it has carcinogenic effects.

I would agree with you that the product available now will be less strong and/or have a different active ingredient so I would stick with the other recommended approaches on this thread.