Oxane oil. Yes. That is no wonder juice for carters or something. . It is as old as the road to Rome. The stuff is used to waterproof hard-fired tiles or something. And parquet floors. But a much more important feature is that it works perfectly as 'bumpershine'.
But even if you want to preserve the weathered patina of your honestly spoiled classic, the stuff works well.
We are looking for more such remedies. Do you have any tips?