Staph Aureus Skin Infection Chinchillas

Hello,

Does anyone have any advice for dealing with a Staph Aureus skin infection in chinchillas?

I have 2 male chins housed together in a double Ferret Nation cage.
The older male began to have whiskers & fur loss near nose. Skin was slightly pink. Also skin dry, flaky (later crusty). This happened very gradually (over a week perhaps) the first day I noticed his nose hair thinning/the pinkness I thought it was just irritated from pushing through the bars to get hay; I had just recently bought & started using a bass equipment hay feeder on outside of cage.
Then, the younger chin housed with him began to have hair thinning & pinkness. I made appointment with vet the next day. Younger chins became worse quickly and by the vet appointment the next day he had crusting behind ears and his nose was red. Since then have noticed redness, crusting on feet, inside ears, and base of tail.

I have consulted two exotic vets and they basically both went through the same diagnosis process. Stated that the skin infection was likely either: 1) Fungal, 2) Bacterial, or 3) ectoparasites (mites). Also possible to have a secondary bacterial infection cause from scratching at mites, fungus, etc.

Both stated clean cage as often as possible (every day or every other day). Ive been nearly always clean cage daily using hospital-grade disinfecting wipes. Occasionally I have to work late & clean every other.
Fleece laundered daily. Wash twice (1st wash tide & 2nd wash health grade laundry cleaner). Run bleach through washer after.

Treated with ivermectin in case of mites. (2 injections, spaced 1 week apart)

Treated with sulphur in dust bath in case of fungus. (2

Treated with antibiotics for bacteria. (SULPHA 1 week but little improvement so switched to Cipro. Been on Cipro 2 weeks. Cipro is much harsher & they are getting supplemental feedings of critical care & probiotics (minimum 2 hours before/after antibiotic given).

Initially, cause was unknown so treated for everything. Since then, culprit is believed to be staph aureus bacteria - supported by swab & cocci appearance under microscope. Do not have staph strain information because don't want to risk chins worsening if off of antibiotic for 3 days to get sample for culture (if they are on antibiotics culture results won't be accurate). Suspected it's not MRSA because abscess on one chinchilla's chest has shown significant improvement in response to Cipro.

Problem is that staph clings to hair follicles & is hard to get to with systemic antibiotic. Try to use topical treatment on feet, ears, etc but it's not as effective in chins since they try to get it off immediately.

Any advice for treating skin infections in chins?

I have blue kote, silvadene, trichloro 4 wipes etc. but it's so hard to get liquids/ointments on their skin because of their dense fur. Also it irritates them & they work to remove it faster than I can apply it. Is there any antibacterial powders for dust baths?

Any advice would be appreciated! My vets have been great this last month but I'm hoping for more insight if anyone has it.

Thanks!