I have not used it on the coffee maker, but PBW made an old SS thermos very shiny on the inside.
Our coffee maker needs to have vinegar run through it to dissolve scale. The carafe, I would just use PBW and hot tap water.
I use it in the carafe every few months, soaking overnight. That works terrifically, but I haven’t tried running it though the coffeemaker itself.
Brilliant! I’ve used it to break up burnt-on crud on pots and pans, but never thought about running it through the Keurig. I’m thinking PBW > vinegar (to neutralize & help dissolve scale) > 2x hot water rinse should do the trick
The scale in mine is most likely calcium carbonate from our mineral laden water. An acid like vinegar will take care of it. If you don’t use vinegar or other acids, coffee makers last a year around here.
PBW works great on organic deposits, so it will take care of the brown build up in a carafe.
All right, I’ll run the test and report back.
The text under the photo says ‘likely caused by’ a high concentration of pbw for 8 hours.
I’m not going to argue that pbw can cause a problem but those are weasel words. They need to prove it causes problems. Why not work with 5 star since better bottles and pbw are a staple in just about every homebrewers garage?
Again, I’m not arguing with you or better bottle. I just would like clear evidence and not maybe it was caused by misuse of a cleaning product.
Works like a charm. Coffe has been much better all week.
Well, at least when I make it. 
I get that size a special order from my LHBS. He charges $145
FYI - I ran some PBW through my Keurig a couple of weeks ago and it worked like a charm. I put about 1/2 tsp in 8oz of water (I have a single cup brewer), then ran the PBW water through twice. I then ran three “rinse” cycles through it. Five years of buildup is now just like new.
Hope this isn’t too much of a hijack- Why is it that PBW works great here but oxyclean leaves a gritty deposit after a few hours? I’ve always assumed its a water chemistry issue but I’m curious if anyone else has run across this.
Thanks
PBW has a second chemical that aides in rinsing. Supposedly, one can make their own pbw with oxyclean and tsp substitute powder.