The advice in post #21 to use a wash that includes a wax coating is the answer to galling (and tarnishing), but previous galling will mess up your PTX plug. I use fine emery cloth to clean up my expanders.
For one who dry tumbles brass, I don't have a good way to do the rinse except on new brass, on which the galling occurs for me. Otherwise, I expect my washed range brass would be stripped of much of that wax coating during tumbling, post wash and dry. I will have to try that car wash as all or part of my sonic cleaner solution. Iosso offers a product that should do the job, but it is pricey and is shipped as a liquid. Basically, my fired brass is fine, and this seems a problem only for new brass and wet tumbling.