My wife bought a bottle of The Works, a toilet bowl cleaner that we had not previously seen. We wanted something that would take care of rust stains and hard-water scale, which are a problem at our house in the mountains. My wife thinks that it cost $2.50 for a 28-ounce bottle.

What it is

The Works came in a plastic bottle that has a bent neck, making it easy to squirt it up under the rim of the toilet. What shoots out is a thick bluish liquid, which has a pleasant mildly perfumed smell. The active ingredient is 20-percent hydrogen chloride -- more about this in a moment.

Using it

As I said, the...