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Cleaning instructions
Chapter 2 - Cleaning the parts 

Chaper 2. Cleaning the parts

After the above procedure and a first inspection of the parts, I heated water in a bucket for washing and added some citric acid.

I prepared myself with protective gloves and goggles and started off with an old toothbrush as the best and cheapest tool to clean the small parts and folds, where it is difficult to get access to.

Most of the dirt and debris came off of the parts quite fast in the hot citric solution.
After I’d cleaned the font, frame, centre bottom plate and the ventilator I washed the parts again in water with dish detergent added in order to stop the chemical reaction of the citric acid.
The other parts like gen and pre-heater were specially cleaned in an ultrasonic bath with citric acid again. They came out very nice and clean.

However, the brass changed the color in the citric acid to a reddish tone because small particles of zinc are consumed in the bath and the copper shines up more. I polished those parts with fine steel wool and they now shine nicely in the original brass tone again.

Pic. 3: The bucket with the main parts in citric acid

Pic. 4: Font, already partly cleaned

Pic. 5: The cleaned vent