What is plumbing Clogger?

I saw a sign in a Plumbing Retailer that said "Clogger is only sold to Licensed Plumbers" What is this Clogger they are talking about?

Robert F2007-09-06T16:37:45Z

Favorite Answer

What it is is actually raw sulfuric acid with a fairly high concentration. like 30 - 45 %. what is used in car batteries is about half that and purified.
If you get some be very careful as it will foam up and spill making a mess and the acid being highly corosive will ruin floors, walls carpet and just about anything it touches.

Bare B2007-09-06T16:19:46Z

I believe it is a high acid concentrate drain cleaner used to free clogs. Because of the high acid content, you really have to be careful with it.