you mentioning about "cleaning it up" .. reminds me of the people whom have come on the "Antiques Roadshow".. with those rare copper lamps.. that they polished up,.. yeeup.. they polished 50K dollars of value right out of them cuz they removed the patina.. i would say.. leave it as is..I was at a tractor show today with a flea market and picked up this old change gear rack.Im going to see If it will clean up without destroying the paint or the lettering otherwise I will leave it aloneView attachment 414253