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There is no one answer for your question. Different products come in different concentrations. Concentrated detergents require mixing prior to use. If you're using products that are specifically intended for use in a pressure washer, there's usually a mix rate on the label.
If, instead, what you're asking is the blend ratio of the chemical injector, there's many variables involved, but it's typically in the neighborhood of 15:1, give or take a few.
"HONK if you've never seen a gun fired from a moving Harley"
I recently bought an RD80704 and wondered about this too, and after thoroughly perusing the latest owner's manual, I found that the blend ratio is set at 20:1, which seems kinda high. For example, all of Krud Kutters power wash concentrates are formulated for 10:1 use, so they would be diluted too much when using the chem injector. I called Ridgid TS to see if this could be adjusted/modified and they said no.