my guinea girls have mites,i got some mectin stuff from our vet, but he wasnt helpful about , where we got them from, and how to prevent reinfestation, ive washed out the cages, with bleach ,sprayed the walls they are near,i had big bag of hay and straw next to pigs should i chuck this.pigs are now on news paper so i can change daily, any thing else i can do, never seen anything like this.