It's probably static electricity that's causing the powder to stick. I'm having a minor version of this problem with Power Pistol. A clean, dry artists paint brush will remove the 'clingons'.
Back in the day, removal of clinging behavior was supposed to be cured by washing the part in a detergent/water mix and drying it without a rinse. I can't recall trying it. I have brushed graphite on various powder measure parts to prevent the issue, never tried it with the plastic tube, but should work.
Running a pound or so of powder through the measure is intended to leave a mist of the graphite from the powder coating on the working parts. Pretty much the same thing as what I did/do with a brush and graphite. Getting the graphite out of the brush is a wee bit of a trial.
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