the ONR product was designed for a "no rinse" wash via 2buckets or 1 bucket with several gallons of H2O and few ounces of ONR.
Based on my research onr is designed to emulsify and draw dirt into the wash media. Where a shampoo is more of a loosen and rinse off method. Thus I'm not sure it would add much benefit but I will probably leave behind that onr slickness. If you try it let us know how it works out.
Honestly, I've never tried it but I doubt it would do anything. ONR doesn't sud when you pour water on it, so through a foam gun I imagine it will just flow through like a spray bottle. But in a stream. Not a spray. Because it's a foam gun.
