I'm a huge fan of the Green Works products.  You get the same amazing clean that you can with regular harsh products.  It doesn't affect my asthma, so when I saw they had a toilet bowl cleaner, I was sold.  Another good thing about the products by Green Work is that they're not hard to clean with.  I don't have to wear gloves or anything.  This product line will forever be under my cabinet.

http://www.ijcsa.org/Green-Cleaning-Services