Hi,
Is there any way to clean electric motors without removing motor shield and unsoldering connection etc ?
I mean, using a spray, soaking etc, or whatever else.
Naturally, I do understand the best way is to remove motor shield and take out the rotor, but whenever I did it, several connections were broken when displacing cords, no matter how careful I am and even working under a loupe.

Thank you.

Definitely NO!

I believe that Dale is just being polite.

You should just toss it in the trash before you waste the chemicals to try what you suggest, which would probably destroy multiple parts of a cool little machine.

You don't have to desolder anything though to take them apart and they do need opened up and cleaned from time to time. In my experience they seldom require anything more aggressive than some isopropyl alcohol, which is a wonderful cleaner for anything beyond gunked up and destroyed.

These motors are quite functional but also quite ancient and they will last forever if properly cared for. Be sparing with the oil and watch for bad brushes, which were common four or five years ago and be careful because they have so much torque that they could probably pull over your house.