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Once I've washed my NSU 1200 C with scouring-creme and a cooking-pot-sponge 
That car has burned a lot of oil, so the whole back was sticky with smeary black oil-dust.
The painting (which wasn't good and original anyways) I could fresh up later with polish and wax - but the colour of the license-plate and even the registration-stickers on it were gone.
Such a car I had, even in the same colour: http://www.imcdb.org/vehicle_118734-NSU-1200-1970.html
That car has burned a lot of oil, so the whole back was sticky with smeary black oil-dust.
The painting (which wasn't good and original anyways) I could fresh up later with polish and wax - but the colour of the license-plate and even the registration-stickers on it were gone.
Such a car I had, even in the same colour: http://www.imcdb.org/vehicle_118734-NSU-1200-1970.html