Factory hitch corrosion control

I had to get my truck back on the road quickly to tow a trailer. What I ended up doing was loop a rope through the hitch tube and run a several wadded up orange/onion bags through to loosen up and remove as much of the crud as possible. I banged the hitch vertically a few times to remove the loosened material. I then took a few rags soaked in Rustoleum that I had on hand and ran it through the tube a bunch of times, adding paint to the rags each time. For a quickie fix it seemed to work ok.