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Allan Wakefield
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5,857 Posts
Sure you didnt sneeze?

Could be flux build up from some dodgy soldering OR could be a damp build up - either way a soft brush will remove it and it wont affect motor performance UNLESS the joints are not made well.
Clean them up and touch a soldering iron (hot obviously! before someone pulls me on it) to the connections with fresh solder, that should do it

Any other deposits anywhere?
 
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