Am I the last one to find out about this? In the past I have used Dawn, baking soda, vinegar and water, or apple cider vinegar. I can’t use bleach because I am unable to touch a bleach bottle without getting some on my clothes. I scrub my troughs regularly, usually using Dawn dish soap. I recently heard about using Listerine as a cleaner and my troughs look amazing, and are staying clean for far longer than usual.
Just a heads up for anyone who has never tried it. It’s hands down the best thing I have found for trough cleaning.