After reading the label, I decided that the inside of my ancient dishwasher was a really good first project. The pictures on the left are the before & the ones on the right are the after.
It worked really well on the lime/calcium build-up. It also did a fantastic job on the dirt on the outside of the dishwasher, but I don't have a picture for that. I was surprised how quickly it worked. Another plus is that it doesn't have an overpowering smell. It took very little to clean my whole dishwasher inside and out. The 26 oz bottle will probably last me at least 6 months.
My next project is to use it on the soap scum in my fiberglass tub....I can't wait to see if the CLR can actually get it back to the original white.