Krytox 105 Oil
Got Spring Crunch? Or Spring Ping? Lube it Up!!! Krytox 105 is usually used for springs but can be used for switches as well.
Tip: Drop some lube in a bag or container, throw your springs in and SHAKE IT
How to Lube Springs
Personally I like to use the "Tub lube" method of Spring Lubing which I learned from Apiary Keyboards - instead of putting your springs in a bag, you use a plastic tub, I've found this provides a more even coat over the springs.
And remember.. Don't pull springs apart. UNTWIST.