Hey all, just wanted to chime in. D120 Glass Cleaner Concentrate has been very popular for many many years with raving fans on a global scale. We are talking customers which would call us just to rave about it. 4.4 out of 5 stars on Amazon.com based on 116 reviews. It is also widely used in high volume & "high end" pro environments & simply put, we just don't get many complaints. It is fair to say that Perfect Clarity Glass Cleaner & our old NXT Generation Glass Cleaner are both derivatives of D120 Glass Cleaner Concentrate as well.

Hope this helps!

Nick