Why is all the metal under this bathroom sink rusting? #diy #plumbing #helpingothers

Let me know if you've ever had any experience with this. This is pretty wild. So I came over to fix a leak at my neighbor's house across this tree. You can see that drip right there. But I noticed a lot of other things that were very alarming. You see all this rust right here. And you see this corrosion right here. This is underneath his sink. Right, you get up here and you see it everywhere. It is wild. Take even the screw heads and the hinges, the braided flex supply lines are starting to break down. If we zoom in here, you see that right there? These are starting to break. You can actually see where that's bubbling out. Even this 12-22 POSY-TIM cartridge, there's HD cartridge that he's got underneath the sink is even starting to change in the package. I wish I had known my neighbor had this because I wouldn't have bought one. But check that out. Everything is starting at anything metal. It's just destroying.