I use kroil, coke is best used if subject can be soaked in coke-cylinders, etc. Modern Metal Rescue in gallon cans at Home Depot works well, needs to be warm.

Dave, went to Pueblo a while back, didn't know about you, or I would have swung by your place. Sorry

Ed

Last edited by EdPruss; 09/20/2017 2:32 AM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.