I also use series 7 brushes, i recommend getting The Masters Brush Cleaner. This stuff is awesome and really does clean well. I personally recommend never letting paint get above halfway up on the bristles. While you can get paint out od the furrel its not easy and does take time. It's bad enough that the normal wicking of the brush pulls paint into it, providing a shorter path just makes it easier for the paint to get there. You will eventually want to get a size 2. My standard use brush is my size 2 as series 7 tend to run a bit small.