WD 40 is good for getting tar off your shoes and sometimes out of a rug...
it is not great lubricant or penetrating oil... it is primarily kerosene and
silicone

Aero-Kroil from Kano Laboratories is remarkable penetrant.... this and their
other products can be found at www.kanolabs.com... from my experience they
are a small most accommodating company who have taken great care in their
products and claims...