The blower motor was "chirping" in my truck, so I took it out expecting to find the box full of debris.

Nope.

But spinning the squirrel cage showed the bearing/bushing to be dry. I sprayed it silicone lube and all was great- for about a week. Now the chirping is back, indicating that I need a better lube. What works best, and preferably not some special one-use-only type product?

Thank you!