There is nothing in the bird seed that is going to dissolve in acid or base ( muratic acid and draino have been suggested). And as suggested eye protection just in case. Suggested before was baking soda and vinegar. Send down a high concentration of baking soda in water let it soak in and chase it will vinager. Cover the top of the drain to build up some pressure to move the clog.
Or just use a snake or water jet.
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It is the mark of an educated mind to be able to entertain a thought without accepting it.
- Aristotle
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