When and how do you maintain your bearings?

[Finnster]

IDK the ideal way, but I wipe them off well, use some bearing oil liberally, wipe them off well again (oil tends to flush out dirt,) and re-oil lightly one more time. It was some bearing oil I got at the LHS w/ a fine needle tip applier.
I've revived many sticky bearings this way.

You could use WD-40 and blow some dirt out if they are really dirty and crunchy, but its not sufficient for lubrication. Bearing oil is needed either way. Usually by this time I am tossing the bearing anyway.