After fixing cold solder joints, then use this:
I get this stuff at Home Depot.
I expect there are similar products elsewhere.

The 2-26 is for sliding contacts like the TPS, fan speed control, radio volume, & door lock switches.

The QD is for contacts like the window switches, various push buttons, connector plugs, & light switches.



WD40 is not intended for electrical switches & contacts.

 

I have tried this stuff on a couple old harnesses we used in some restorations....works very well

 

is this stuff just like dielectric grease? im asking because im also redoing my electricals and dont want to buy two different products that do the same thing. thanks

 

Dielectric grease and the 2-26 stuff overlap some in application.

The 2-26 will get into places like the TPS, dielectric grease will stay in place better in weather exposed connector plugs.

 

so you just hose whatever you want to be cleaned down with the stuff? sounds like something i need