CLR itself is amazing but I marked off two stars
because it was supposed to be a kit with a little brush but all I got was the CLR bottle.  That said, the CLR product itself is A*M*A*Z*I*N*G!!!  Bathroom sink counter crud I has been scrubbing on for months with various tools and products was completely gone in 60 seconds.  I only wish I had taken a before picture as evidence!
Rating: 3 stars