On Mar 29, 9:01*am, "bob" wrote:
Years ago I bought a bottle of sulfuric acid from a hardware store with the
intend to open a clogged pipe. I ended up opening the clog with another
method. The bottle sits unused.

Many toilet bowl cleaners use hydrochloric acid as a main ingredient, since
sulfuric acid is similar stuff, can I use it as a toilet bowl cleaner?

I hope you're not serious:

http://msds.chem.ox.ac.uk/SU/sulfuri...centrated.html

http://www.jtbaker.com/msds/englishhtml/s8234.htm

http://en.wikipedia.org/wiki/Sulfuric_acid

It is not that similar to hydrochloric acid.