There are definite times to use WD-40, or lithium, or silicone spray.

WD-40, I think collects dirt, so you have to be careful where you use it.

Lithium is great, but does not run into areas where you need it. It only stays where it was spraayed.

Silicone, I think it does not corrode rubber, not sure, but you can spray it, and it drips into cracks and crevices. I recently changed my struts, and now I get a creaking sound when I go over humps. Bilstein said it's possible when I changed them, the control arms got stretched beyond where they normally got stretched, so he recommended I spray silicone on them, but warned me against using WD-40.

What lube should we use on the latches, etc.?