Oil will trap water under it so if its not completely dry...
I also use a Flower Frog. A tip I got from Outback years ago. It will hold a razor by the tail partially open up on a shelf for over night or longer before I can put it way. Its dry for sure then.
T.P. is great for moisture. It grabs the water much faster so you are sure its dry. I use it to test for plumbing leaks too. If you can wipe a bit of T.P. on a fitting after the water is on and come away dry you know its not leaking.