Fill it with Evaporust and let it set overnight. Pour out the Evaporust and spray with PB Blaster or Kroil and let set overnight again. Then fill with Kerosene and start working it. A little gentle persuasion with a wooden mallet might help. Good luck.🛠

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)