WD-40 to clean electric contacts?

The issue with free-flight two and four-stroke diesel glow engines is that the general lubricant is either a PAG based oil, or castor oil, typically f rom 17% to as much as 25% of the fuel (the rest being Methanol and often bu t not always nitromethane). Not all of this oil burns. The residue that has not been reduced to hard varnish is soluble in WD-40. Rinsing with WD-40 a nd not completely removing the residue spreads it thinly all over everythin g - which then promptly gums up as the WD-40 dissipates.

It is not the fault of the WD-40, but of the user, for not using enough.

Peter Wieck Melrose Park, PA

Just my 2 cents, but I think PB Blaster is an excellent product for loosening bolts and other automotive uses. Much better than WD40. I have never used Kroil. Mostly cuz I never see it sold anywhere in auto parts stores. But I heard it's good......

What is "Ed's Red"?

Kroil is sold on line. I use it because it works.

A home brew mess for cleaning guns.

Watching a video or two, Liquid Wrench came out on top for nuts and bolts.

Greg

Yeah, "I saw it on youtube (or facebook)."

That's laughable, Liquid Wrench is better than WD-40, but PB-Blaster is better than Liquid Wrench, and Kroil is better than PB-Blaster.

That's just the way it is.