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Judging from the picture that there is leakage in the connection during installation, use sealant to block, it is best not to dismantle it, find a thin wire and bend a small hook from the top to see if you can take it out, the drainage pipe may be damaged as long as it is removed, or close the tap water angle valve below, disassemble the link pipe, take down the vegetable washing basin, and dredge the ,-- from the opposite direction
If you can wash it away, you don't have to worry about anything, and if you can't wash it away, it's more troublesome. To be taken apart for dredging.
If you want it or not, you have to pick it up
Don't worry too much about this, just wash it carefully with dish soap, or soap, or hand sanitizer.
Nothing in the way, just take it off!
First of all, toilet pipes and electrical pipes are two different things, so you don't have to worry about electricity. Second, the pushpin won't pierce the sewer pipe, you can flush more water and try to flush the pushpin down.