Interesting question. Just came across a recommendation in Joe Anna Arnett's "Painting Sumptuous Vegetables, Fruits & Flowers".
Mix together 1:1 solution turpentine and 91% isopropyl alcohol (which is stronger than drugstore isopropyl alcohol--you can supposedly order it from a pharmacy). Pour the mixture over the canvas and allow it to rest for a few minutes. Scrape the canvas with a dull palette knife. Don't let the knife dig into the primer level.
I haven't tried it but good luck!
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