My team mates have an addiction for wd40, and it hasn't hurt anything. Seems good for hosing out the pivot balls.
I use silicone spray for the balls. It dries and doesn't attract dirt.
To lube my bearings I remove them and remove their shields and pack them with grease by hand. If I don't have much time, I wipe them clean, toss them in another racers pitbox, and install new ones. Bearings are only $1 afterall. Generally, well greased bearings survive a few washings. I wash my car in a sink. Another racer has an extra dishwasher setup just for RC.
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