Ain't sure, but . . . looked like the test procedure involved only short-term marination (brief "soak" time).
Silly me, but . . . I've THOUGHT I had good results with PB Blaster; AFTER a considerable immersion time. Don't know where I got the idea (Instructions?), but . . . I somehow thought a significant time interval necessary for the chemical catalytic action effectively occurring.
Alas, my belief system is destroyed; PB Blaster is now proven no good whatsoever.
Good thing I've got my IMPACT DRIVER and 7-amp IMPACT WRENCH, if there's no, "Better living through chemistry!"
DISCLAIMER: No financial interest in PB Blaster.
“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre