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IMO, a longer auger, rented or via a pro is what you will eventually end up needing. I've got a manual 25'er that I've used many times on rentals, etc., but occasionally to no avail. Then I call a pro, and they (using a powered, longer one) typically dislodge something WAY on down the line. Once I've done what you've already done...I'm calling a pro (which I certainly am NOT)...you'll never see one of them use any of the suggestions (or similar) already offered that only clear a minor clog imo...YMMV.
ps: On the couple of times I've needed to call a pro, any other attempt that "I" would have made would have been futile anyways....those ended up being "objects", not buildup etc. Good luck!
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