Stop in for a cup of coffee

Tooljunkie said
Heat and water. But wont work if you spray penetrating oil on it. Seems to boil out the rust.

All ears Frank.
Do you wet it and then apply some gently heat to get it steam?
Happens it blew off on a rainy day. Plenty wet and I had a portable soldering iron with open heater tip with me.
I didn't work on it until the part came in the nxt day.