What's wrong with it? Musty smell but otherwise clean? Stains? If musty, spray down with rubbing alcohol, let dry then spray down with vinegar. Should take care of most of the root cause, but will need a few days for the vinegar smell to air out.
Stains: soak stains, apply either stain remover or dishwasher soap to the area, let soak, then either rinse off carefully in a bath tub or in a washer using the delicate option. Washers will contribute to fading, keep that in mind. So will the sun, so do not dry in bright sun on a hot day. Do not dry in a dryer on hot either as that is also not good. Outside, not in direct sun, is good; day light will also take care of mildew. When wet, do not hang on a flimsy hanger such as a wire hanger, as that will stress the, heavy from the water, jacket unnecessarily.
Hope this helps. And please post some pics, I love M65s;-)
Edited by Albert, 23 September 2019 - 03:46 AM.