Looks like the original Sani-Flush was still being sold until 2009 or so. With its main ingredient being sodium bisulfate, when some people didn’t follow directions and mixed it with chlorine bleach (drain cleaners like Liquid-Plumr or Drano), it created chlorine gas, which can be fatal.

Grocery shopping in 1964 was much more exciting thanks to Sani-Flush!

The ad copy:

“Is that up to ME?”

Scrubbing toilet bowls is not your job. Sani-Flush makes toilets sparkling white the quick, easy, sanitary way. From now on use it at least twice a week to remove unsightly stains and discolorations without scrubbing.

Don’t confuse Sani-Flush with ordinary cleansers. It works chemically — cleans the hidden trap. Each applicatoin cleans away many recurring toilet germa and a cause of toilet odors. No special disinfectants needed. Does not harm toilet connections. (See directions on can.) Sold everywhere — two handy dizes. The Hygeinic Products Co., Canton, O.

Sani-Flush

Cleant Toilet Bowls Without Scrubbing

Replacement or refund of money
Guaranteed by Good Housekeeping 
if defective or not as advertised therein