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On ebay, a company (RF Giardina from Oyster Bay NY) is selling  armature cleaner for motors of toy trains. Does anybody have any "experience" with or knowledge of this cleaner. I understand that one must be careful about what is used-especially not to dissolve the insulation around the windings-and so even seemingly innocuous liquids like alcohol are potentially harmful. Thanks in advance, turtle7

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Careful!  I would only use "plastic safe" cleaners.  To clean the motor as unit, or components.  CRC QD is the one I currently like best. 

NEVER use cleaners that are "concentrates", or that include water- the armatures are made of steel or iron.  Simple Green (70% water).  Maybe Denatured Alcohol- also known as "stove fuel"- so, hint- it's flammable!  70%- 90% Isopropyl Alcohols also contain water.

Commutators can be cleaned using the denatured alcohol, or the contact cleaner- or even a pencil eraser.  Then use a toothpick (won't scratch) to clean carbon out of the segments/ separators.

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