Marcus, I use Damar Varnish and I experience the same problem that you described. The solution that I found works well. After thoroughly cleaning with turpentine, I wash quickly with a regular bar of hand soap. Then, I immediately was a few times with brush soap. The hand soap is stronger than brush soap and will get rid of the stickiness. By immediately washing a few times with brush soap after using hand soap, you'll protect your brushes from the strength of the hand soap, which will dry out the brush in time if you don't rewash with the brush soap. I've been doing this, and my brushes are fine.
Anthony
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