As to the base pin, most of my Rugers still have the original factory base pin. Only two have the Belt Mountain base pin, and these guns I bought used.
As to cleaning out the goop, I've removed the grips and cylinder and dunked my guns in a deep pan filled with lacquer thinner and flushed out any factory stuff. This degreases the gun completely, so some type of oil or wax is required. I've never used wax, but do use my concoction of 50/50 mix of motor oil and Three-In-One machine oil. I wipe it on fairly heavily then wipe it down with a shop towel.