What would you use to clean the gears of an old trolleybus?

railaddict

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I hope I'm in the right place to ask my question.

I have gone through the german companies I knew in the time, like Herkat and Lux but they have only material to clean the track. I have found an old Ehem trolley and the gears are full of hair, dust, grime.
I was thinking of something like a spray that would dissolve all that dirt, without damaging the gears. Does it exist or maybe you use someting else.
 
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