• I think Midlife's suggestion is the best bet. If that light blue paint is stoved it should resist solvents, but if it isn't stove enamel it's probably not worth saving because it won't be the original finish.

    There are other solvents stronger than white spirit and less potent than cellulose, but my knowledge of availability is a bit out of date - there must have been a lot more Heath and Safety since I was in this trade. In any case, use powerful organic solvents out of doors - the fumes are not beneficial to health!

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