Chris Wilson wrote:

Frank Erskine wrote in
:

You could try spraying some contact cleaner in through the motor
cooling slots and running it ..

But NOT WD-40... :-)

This may be a silly question but why not? WD40 is the first thing I'd
reach for.

'cos WD40 is a basically a water dispersant. Although it's also a
cleaner, it's more likely to create a paste of elecrical/carbon
deposits and feck the motor good and proper rather than dispersing
them. Contact Cleaner cleans off carbon deposits from the brushes/comm
quite easily, but is a solvent with a low flash-point so might
'flame-out' a little ..

--
Paul - xxx