I took the entire cover off of mine and took the chance to vacuum out all the debris in the motor area. For the rollers on the container that was pretty easy. I used a putty knife to scrape the inside of the unit clean and vacuumed it out. The container rollers are a revised design and required that I snap off two tabs of sheet metal on the frame. Once done though, they improved a problem where the rollers could sag when the frame bent. The finished result is amazing and the unit functions better than it ever has.