Diatomaceous Earth! *EDIT: Make sure it is Food Grade. This is listed on the bag. If it is for use in pools/cleaning, do not use it.*
This link on site says it is dangerous. I use it sparingly when needed and have had it recommended by pocket vets, breeders,shelters and sanctuaries soooo….as with all bunny related activity: It miggggght kiiiiiilllll themmmmmm !!!!
https://binkybunny.com/FORUM/tabid/54/aft/120680/Default.aspx
“I know some pet rescuers who are afraid DE will dehydrate the bunny if you put it on its skin to kill fur mites. However, there is overwhelming info and testimonies explaining that such sharp shreds are so tiny that they only bother insects (scratching their waxy cover and thus making them lose hydration through those scratches and as a result they die). However, the size of such sharp particles is so small, it will not harm an animal or humans. If it was, then many would use it to kill mice and rats.”
source
It is light and sticks to everything so do it in the tub or outside in your “messy clothes”.
The minute one of my buns itches I rub a couple teaspoons’ worth into their fur and ears (not in the ears) for two mornings in a row and again if they itch again.
A bag at a pet store or even garden supply store costs between $10-20 and lasts for every time they seem ‘mitey’. Also, sprinkle a couple spoons of it in their litter for a week.
I am comfortable with other homeopathic remedies and my buns respond well to them but they have mixed assertions/disclaimers from various bunny expert sources, so I won’t recommend them but this is one that works so well for me, my friends and vet and it is well supported.
https://www.peta.org/living/companion-animals/abcs-cruelty-free-flea-control/