why does baking soda and vinegar unclog the drain?

We've been using this method to unclog the drain for years. Why does it work?

That website you linked to is like everything else I've found on google. It just tells you it works with no explanation. I wanna know why it works, not if it works.

Onto my next question.How the bloody hell do I clear out my kitchen drain air vent?I've snaked my kitchen drain 4 times. It's clear. But it's still sloooowwww. The mainline is ok because water drains just fine from anywhere else. So, it has to be the bloody air vent.Since my house is 3 story high, if you don't hear back from me, assume that I've fallen to my death trying to get the bloody thing from the roof...

Ok, guys, I had a professional come look at my system. He confirmed a few things:(1) It's definitely not the air vent. My air vent is fine.(2) I have a unique kind of clog. He called it organic clog. It's like a membrane. A snake will go right through and everything seems fine. But as soon as you pull the snake out, the membrane closes itself back up.He told me the only thing I can do is keep pouring strong acid down there until all of it is dissolved. And he didn't even charge me a cent.Looks like I'll be pouring acid down there for the rest of the day.

Too late. I battled with that creature for 3 days. My sulfuric acid finally won out.