Look Ma, No Hands!
I use LPS-1 when everything else fails. Expensive. $16 over five years ago. Meets Mil specs. Had to order from Granger.
I’ve also used LPS-1 exclusively when working on aircraft -as borgward pointed out that it meets MIL specs.
Back when I practiced my A&P trade, every guy in the shop had cans of LPS-1, LPS-2, and LPS-3 on their boxes. Great stuff. I wish it was easier to find at a reasonable price.