SUPCO isn't too bad. You can get it at Grainger for $5 (seems like it might be a 6 oz bottle). Has a little tube that pulls out to reach places. HVAC guys I know now use Nu-Calgon mostly...not cheap. Kroil used to be very good, but it isn't the same today. Something changed around 2019 and the price went right through the roof. And it doesn't seem to work as well. The HVAC guys I know don't use it any more. Another one is Mouse Milk. Aviation guys use it a lot but from what I have been told you have to leave it on for a while to let it work.


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end