Hi Lonn,
It is great to see you posting.  I would think that either kerosene or
mineral spirits should clean up the grease and dirt without affecting the
paint.  It should be tested first in an inconspicuous spot.  Also, as with
any solvent, it should be used with adequate ventilation and while wearing
nitrile gloves.
Sincerely,
David Ryan
Registrar
Colorado Springs Pioneers Museum
www.cspm.org

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