I've never had success with Draino, but Home Hardware has their own drain cleaner, which un-clogs anything.
Oh, and like the others mentioned.....you need a trap.
The two clean outs are weird. Can you see below? Original plumber didn't get things lined up right on tail piece to plumbing. Shows lack of caring. Who knows what they did.
I would pull the plugs and snake the drain. By feel (or camera) you can get an idea of what is happening.
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