The next main thing you’re going to want to, after cleaning the axles, is is to get some lube around those axles and potentially (read ‘A bit about the motor’ here, and blog post here) into the motor. You don’t want anything too sticky or oily, I’ve found CRC 556 or CRC Noxy the best, this is because you don’t want anything that’s just going to attract more dirt (you want something that will repel it – CRC does that). Also it is difficult to get to the innards of this motor (unless you drill out the rivet), so you need something very fine that can penetrate through a small crack (again CRC). Once you sprayed a little around the axles – using a straw nozzle attachment, spray a little along the top (again with the straw nozzle), and a little around the flywheel axle joints. Then give it a good rev up a push the clutch flap (that button normally presses) to get the lube moving into the motor and parts.