Thanks Fleecewife - as ever you're full of excellent information!
That was revolting. The cobwebs DID go up like a rocket, and there was a smell like burning hair which I presume was the mites....? Bits of straw were quite flamable too! Funnily enough, when collecting eggs over the last few days I thought the hen house smelled different. Not just pooey.
I discovered the mothers of motherlodes. Our hen house came with plastic feet wrapped in bubble wrap. We had a Helpx-er who decided it would be better if the whole house raised up higher, so he built a frame for it and raised it. The bubble wrap was still on the feet...... Holy God the seething mass of mites, eggs, poo, etc inside the bubble wrap was repulsive. I couldn't really take the weed wand to them because there were still bits of plastic stuck to the feet, and I'd just put fresh straw and newspaper inside the house. I threw Diatom around the feet, do you think that will help? (Also there was a hen trying to get in to lay, didn't want to send her up in flames!)
I can't believe you did it every two days, what a drag. I might manage once a week! I hope the canisters last for a good while. Great that you managed to get rid of them. Horrible horrible horrible.
The dogs were snuffling around in old straw, should I Diatom them too? What about the shed floor (the hen house is inside a shed which is open on one side, straw on the floor from kids playing and lots of poo on the floor from Cream Legbars roosting in rafters. Also, do you think the empty hen houses will be ok?
I suspect that this is why my poor hens are bald, and it's not the cockerels' fault after all! I'd quite like to dip my poor hens into a bucket of something which would kill the mites in one go. I'm concerned I'm not going to manage to douse them well with Diatom, and I'm very nervous of my cockerels after having a vicious one.
They're still appearing on my arms. Yuck! A shower it is!