I experimented with this, just based on a hunch: I washed my violin bow's hairs, (just regular dish-soap & water, rinsed, with warm water, dried with paper towels) but here comes the real trick: put just a "dab" of olive oil on both my thumb, and 1st finger, held them against the violin bow's hairs, and then gently, slowly, ran my fingers across the entire length of the hair, until I could feel the oil throughout the hair's length, getting the absorption of the oil. Let the bows sit outside the case, overnight, and by the time I got home from work the next day, tightened up my 2 bows, re-applied fresh bow rosin, and started using them for practice: and it made a HUGE difference, for the better, tone wise, and overall sound: it's a much warmer tone, no more "raspiness", and no more shrill, unanticipated "squeaks" or "screams".
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