Zep products I have found to be the most expensive, and I have never
found anything that they purvey, to be of inferior quality.
Their penetrating oils are excellent.
Kroil, is also not cheap, but I have used this stuff to break free many
a stuck engine, (Minneapolis Moline U, JD A, small block Chevy.) and is
on the pricey side, but it works well.
A Chicago and North Western RR track maintenance guy turned me on to
Kroil, and they used it for freeing up frozen ( rusted ) switches.
Quite impressive.
PB Blaster, works good but, I have found it not as aggressive as the Zep
products, or Kroil, and I like the Kroil the best I suppose because it
comes in a gallon, liquid form, rather than aerosol.( Makes for better
soaking )
This is my educated, one sided, ( the Kraut half ) as usual opinion. :>)

One more thing,
I wish all, on the list a wonderful Holiday, and I also hope you all get
whatever you wished for, from Santa!!

Adios Amigo's

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Terry 85 GL