I do the same - only with a toothpick.
I usually just thump/flick the back side of the seal a few times on both sides after I open it up for the first time. That’s generally all it takes to knock the powder out of the groove. Then it seals right up.
I’ve tried that, but I guess not good enough. I’ll try again next time I open a bag. I’ve splurged and starting using black edition. It also has this problem.
Be extremely careful (of course) and take a knife and clean out the seal of any powder. it will likely go back into the bag.
Use the backside of the knife or a butter knife to do so. Even a toothpick.
I have noticed this as a problem for a while. I don’t drink Huel a lot so I don’t get that many bags, but I think the first time I get them the seal was different and they worked better.
After adopting this process, I’ve had no troubles…
Upon receiving a new bag of drink stuff or soup stuff:
- Tap, thwack, and flick the top of the bag to clear the groove.
- Zip it closed–if clogged at all, pull it back apart (grabbing bag by the wide sides) and return to Step 1.
- Only when firmly zipped, then open the bag with scissors (to avoid little plastic bits from a jagged tear potentially falling into the bag later).
Then, with each use, just flick the top of the bag a few times before closing it.
Hope this helps. 
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