I don't think it's all static. I find powder sticking to the metal part of the hopper and need to use a tumbler brush (the kind at the end of a stick) to loosen it. The brush fits perfectly. I also use canned air by covering the hopper top with my hand and inserting the tube through my fingers.
You really need to wipe the hopper with the dryer sheet. If you want to wipe the inside just wrap it around the aforementioned brush.
I only load 9mm and only use Power Pistol, so this isn't often a problem for me. My problem is that I don't empty the hopper between loading, so there is often an inch or so of powder at the bottom. This eventually darkens and softens the plastic. Fortunately, they are replaceable. I also learned that I can cut off the bottom two inches and have a brand new clean hopper.