Originally Posted by crazyphil

I have posted my procedure ad nauseum, but I will do it again
just for you.

If I inherited a holster like the OPs, here is what I would do.

Put a few drops of Dawn dishwasher soap in a pan with warm
water. Use a kitchen sponge and the mixture to scrub the
holster real good. Rinse it off, towel dry it, and let it
continue to dry overnight.

When completely dry, massage Black Rock Leather 'N' Rich in to
the holster with your finger tips. Rub it in real good and get all
of the nooks and crannies. Then wipe all the excess of, and again,
let it dry overnight.

When completely dry, buff the holster with your shoe brush.
If you want a little extra shine, wipe some Fiebings Tan-Kote
on, and again, let it dry.