This Is The Only Review You Need To Read
This review is the only one you need to read.  Background:  I am a retired marine mechanical engineer.  I deal in the real world, what works and what does not.  Cause and effect, efficiency, and production.<br /><br />My coffee thermos is the brushed stainless steel Zojirushi.  It holds 7 cups of water.  The inside surface is uneven with the brushed surface.  This makes any stain harder to remove, as a rough surface makes adherence easier, examples being paint, etc.  Following the directions, I poured 2 ounces of S n C into the carafe.  I saw that IMMEDIATELY the spot where the concentrate contacted the metal went clean and bright, with the stain coming off in sheets.  I then added 2 cups of warm/hot tap water, approximately 125 deg.  I swirled it around and waited for 3 minutes.  The stain at eh bottom was gone, except for a few isolated spots.  I used a soft bristle brush for about a minute to easily remove the remainder.  I then emptied the jug, rinsed it and looked inside.  The surface was clean and spotless, but there was a ring where the treatment solution reached its highest level.  I then put in 1 ounces of concentrate and brushed the stained ring for less than a minute.  All gone completely.  The entire inside is like brand new.  No evidence of stain anywhere.<br /><br />Reflection:  In retrospect, I could have filled the jug higher with another ounce of concentrate and that stain would have disappeared.  Either way it is a personal choice.<br /><br />Conclusion:  The product works completely, efficiently, and as advertised.  Period.  Full Stop.  No qualifiers.  I will never use anything else.  Why would I?  The coffee stains were about 4 months old, when the coffee maker was purchased.  I always clean the jug, the top and the filter tray with dishwashing soap and water by hand everyday.<br /><br />Any other reports to the contrary are in my opinion, lies, or the results of persons too incompetent or arrogant to follow directions.  It's that simple.
Rating: 5 stars