How to unclog a drain stopped up with powder washing machine soap?

Alt31033733
by Alt31033733
The drain was stopped up by the previous owner when she repeatedly used
powder washing machine soap. The plumber told us that since the drain that was installed was only 2 inched in diameter he did not have an auger small enough in unclog it. Any suggestions out there? This drain was only used for the washing machine and emptied into a dry well.

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