Has anyone use minntech's Minnclean AC and Minnclean TF RO Membrane Cleaner? Did it help?

Both chemicals are good and will scrub your membranes when used properly. When I used to work for a water vendor we would use them to scrub membranes for customers that had problem systems. You may need to check to see what kind of membranes you have to see if they are compatible. Dont be alarmed if your water in your cip (clean in place) container turns a tea color as it is showing the condition of the build up in your membranes. You can check for negativity of these chemcals from your unit by ph or with your tds meter.

We use both products on a regular basis as a preventive measure and so far have had no problems. the product works good.