Hmm for drive in hunts 70 % vinegar. .30 % water..lowers PH level and helps the meat stay in better shape for butchering
for fly in hunts citric acid/water does the same thing..extends the best before date by 3..4..5 days.
I'm not certain about also deterring flies..however as a acid it seems reasonable that it would also clean., repel?

The bear went into ice cooler ASAP. .washed with vinegar. Water..didn't hear of any issues at the butchers/ sausage making.
The citric acid really weighs nothing..and really helps on August sheep hunts..warm fall moose hunts.
Steven