I think, my brother who used to do auto body work and was very very good at it, said, to use one of the dish detergents when stripping down paint. I am not sure which one. I can't remember. He said one worked very well. I have a feeling it was Ajax, just not sure.
I am not having a problem with the drains, I was just watching this tv show, lol, and wondered if it worked. Since, mine was not clogged I don't know if it did anything or not, it just made a very big eruption and cleaned the sink nicely.
What happens to the pipes when you pour boiling water down them? I know before they were fixed under my sink, if the water was too hot, like for instance from draining pasta, the sink pipe underneath would pop off and water would be running everywhere. So, I made sure I ran cold at the same time. I don't have that worry anymore since someone fixed it for me.