Wow I'm quite impressed with Carlson Straight A. I have a nearly unlimited supply of bottles, but they've all had some amount of residue sitting in them for 10+ years. I figured this was going to be a pain to clean them out. Not at all, wow just a shot of hot water with my spray wand, then sprinkle a touch of this Straight A in the bottle, swish it around, let it sit a minute, swish again, and man this stuff just dissolves anything and everything in there. I'm not having to scrub a single bottle, very pleased! I'm not pleased about getting this stuff on my hands considering the ingredients and I'm rinsing thoroughly of course.