I just opened my crb for the first time in 3 or years to repair some damaged wiring. What I like to do every time I use my crb is clean it when I finish using it by first unplugging it, turning it front face down on the ground, remove the brushes, then i lay my vac line next to the underside to catch some overspray from my wand . Spray a bit of water on the underside to loosen any debris, vac it up, put the crb away clean and ready to use for an encap job.