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If you ever wanted to experiment with painting and prettying up an engine, this might be the one to begin with.

I had an Enya 60-4C that needed a bearing replacement. A good friend, whose occupation is farm equipment mechanic, offered to replace the bearings for me and to throw it in his engine parts cleaning vat for me to remove the baked on castor oil. This was about 15 years ago, before the current crop of non corrosive/staining cleaning compounds was available. The engine came out of the cleaning vat a much, much darker grey. It didn't look bad, but it didn't look stock.

I reassembled it and it ran fine without incident. It just looked strange.

I live in the USA and we have recently encountered a product called Dawn Power Dissolver. It is a gelatenous liquid that is sold in a spray bottle. It works amazingly well at removing varnish stains from model engines. If you have an equivalent, it might be worth your time to try it. It might help, or it might do nothing at all. It's also great for pots and pans too.