How To Keep Your Brushes Clean
  1. align brushes (don't you ever work without snapping with brushes)
  2. keep them simple and generally don't use too many angles with them
  3. don't overlap brushes unless you know what you're doing

More thorough text coming later…

Resources

Hourences' BSP tutorial about how to deal with BSP related issues
HOM hunting — Virgo47's tutorial about eliminating hall-of-mirrors (and similar) errors

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