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www.trekell.com. I've purchased many of these now and they are a great value. The site also has brush care info as many do. I've found that if I don't leave them soaking cause I'm too lazy to clean up right away I'm better off. I use Liquin type mediums at times and this stuff really needs a harsh solvent to get them clean also, so I clean them right away after a session.
As Mike has cautioned against, I also "Push my paint around" in the first few sessions almost as if I was modeling clay, until the likeness appears. But thankfully, I'm finding as I become more confident, I'm employing a wide variety of different brush stokes, with paint on the brush! I get where I'm going much faster these days.