Spray with WD40, let it dry off overnight.
Medicinal paraffin or Singer Sewing Machine Oil + fragrant oil, usually sandalwood + kenanga.
Place in a plastic sleeve.
I've been using this approach for around 50 or 60 years, I've recommended it to probably hundreds of people over that time, most of them since I began to use the internet. It works, and gives good long term protection.
Variations from this I cannot comment on because I have not used all possible variations.
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