So I just joined the club last week with the 21L Kendal HB821. I tried cleaning some dirty wiring harnesses today and had pretty good results, but I don't think I am quite there yet. I used Green Power, and according to the label, it recommended a 1 to 30 ratio for "heavily soiled aircraft / cars" which is what I used. It also said you could use a 1 to 13 ratio for cleaning counters and things of that sort, and that the 1 to 13 ration was the strongest mix you can make without the solution become corrosive to metal parts. I errored on the side of caution and went with the 1 to 30 ratio to start. I also had the water temperature set to 60C, and I ran the cleaner for 15 minutes. I added some pictures to show the results. I circled in red some spots where the wires still have some dirt on them, and I am curious if this is to be expected, or if you guys end up with perfectly clean wiring harnesses after your attempts at it. I would say overall the harnesses are about 90% clean, so I am pleased with that, by my OCD would probably still have me cleaning up the last bit of dirt off by hand, and I am hoping I can make some tweaks to the process to improve my results.
Also, do you guys drain the unit after each use, or is it OK to leave it full of cleaner for a few weeks between uses?
Thanks for all the help on this thread, I have been using it a lot these last few weeks!