What's the point of the vinegar rather than water?
Acid reduces pH
Micus, there are some thoughts that fisherman983 pointed out that I'd like to add:
1. Washing game meat before processing depends on the condition its in at that post-field moment before processing. If it's in great preserved shape with no off odors or signs of spoilage then a high pressure wash to exterior surface will clean it well. You might notice when you get meat abundantly wet that the surface tissue retains moisture and swells with a jelly-like reaction in spots, and this can be trimmed easily enough.
2. Wiping or application of anything like vinegar will transfer absorption odors and taste. There is no scientific purpose or benefit of applying vinegar to the surface of your food before freezing.
3. Hanging for extended periods is a risky method because 1.) the length of time it was stored in the field determines how much meat should hang before processing; and 2) the field storage temperature and other the temperature of the hanging meat (home hang or aging locale) will determine the appropriate length of hang time.
NOTE: Glycolysis (sugars in the meat tissue that convert to lactic acid determines the tenderness and final quality of your game meat. storage Temperature and length of storage time varies, so the length of time you should age meat before processing also varies widely. Meat that was stored in temperatures lower than 50 degrees for 5 days has the same potential tenderness of meat stored for 3 days at 70 degrees...so aging the latter an extra 3-4 days will foster greater spoilage colony growth. On average, game meat should be allowed to hang for 5-7 days total, with storage temps below 50 degrees and moisture (humidity) less than 75% with adequate airflow while hanging. If your storage facility is not cold, dry, and aerated, your best bet would be process the meat after post harvest day 4 and before post harvest day 7.