A good weird thing happened.
I have a bass with the typical P config. The split pickup, tone and volume. It was humming. So I sprayed an anti-rust product known as Corrosion X, inside the cavity via the jacket plug by using a thin beak. And the hum is gone! Dead, dead quiet even with tone full open.
"I have enough trouble playing bass and chewing gum at the same time." - Jeff Ament
Lefty Union Member #22