I found ONR would be quite good to use in-between a full wash. Maybe it's just me but I just can't seem to get it to work as good as a proper wash, or maybe it's just not meant for the weather and environment here. I can let you have some the next time we meet.
For ONR to really work, you'll need to throw everything you know about car wash out of the window and start from ZERO.
My advice for ONR wash.
1. 2 bucket method (very very important)
2. Get a grub (or a big pore sponge instead of using lambswool/microfiber washmitt)
3. Get a good drying towel.
You approach an ONR wash on the car differently then a conventional car wash. For ONR wash, you wash and dry panel by panel. For very dirty panels, i would recommend to wash it twice before drying. Correct usage of ONR wash would mean that your drying towel is still clean. Also, ONR could be diluted and sprayed to any panels for soaking purposes to loosen any contaminants on the paint work. This would help to reduce any chance of marring that is inflicted on the paint by a dirty wash product.