Why can't the guy rod it, or jet it
We blasted it with a hoze. Because of the angle of the roof you couldn't get a rod down there, but he didn't have any anyway.
You could cut into the pipe to form a rodding point and rod it from there.
You could also jet the drain; I know you've tried a hose but proper drain jetting is higher pressure.
@Cupcakes started
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We blasted it with a hoze. Because of the angle of the roof you couldn't get a rod down there, but he didn't have any anyway.