It reminds me when my GF would try to kill a spider with hairspray.Lol.
Brake fluid? Someones wife may think it's a penetrant but why not use a good penetrant that's actually a good penetrant? PB Blaster, Aero Kroil, even WD-40.
WD 40 sucks as a penetrating oil, PB blaster is very good. Where do you live ? I have a special nuclear penetrating oil that is not sold anymore in the States. I only have very little left, so that is why I ask if your around N.J. one only uses, one drop of this stuff !