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Kim,
Is it the varnish or the paint that is tacky? It will make a difference as to what you will do. Try a test patch to see which is the culprit. I suggest using some paint thinner on a lint free cloth, like cheesecloth, and GENTLY rub the surface of the tacky area. If the tackiness comes off with little or no color your may have had a varnish that never set up because of the cold. If so GENTLY wiping the surface with solvent and clean cloth to remove the varnish will work.
If a lot of color shows up on the cloth, it may be a paint drying problem exacerbated by the varnish layer. I suggest a few more months of drying in that case. Any adhered dust can be removed with a very light rubbing with 600 grit sandpaper when the painting has completely dried.
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