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Try to bend a hook with a wire to slowly hook it out.
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Dear, if you fall into the deep, then take a thick wire poke, let it fall to the main pipe, if you can still see the hook back into it, if not, you can only find a professional Good luck, remember to adopt if you are satisfied!
It depends on how big the brush is, and there is generally a bend in the sewer, which may be stuck in it, so find a master who dredges the sewer.
It's definitely not realistic to get the bottle out, the bottle is all in the pipe, how can it be out. The only way to get the bottle to the deepest part of the drain should be no problem.
Tie a magnet with a rope and lower it to suck the key up. If you don't have a magnet, you can also find a wire and make a hook in front of it to hook the key up.
Probably not! So big hole.
Don't, there are too many bacteria, don't lose the big because of the small.