Everyone has their way of doing camp dishes. We always used to do camp dishes with hot, soapy water. If we have a site with electric, but without a camp kitchen, we use a coffee maker, or an old coffee urn when there is a huge group of us.
“Brown water” ALWAYS gets dumped down the toilet if you are in bears territory.
We have a new system for picnic, moderately soiled dishes. An old-timer we met in the UP last summer gave us his hiking recipe for dishes. 2 cups of water, 1/4 bleach, 1/4 cup rubbing alcohol and drip of dish soap. It’s 10% bleach so it can be used for blood, etc. The rubbing alcohol is a “wetting agent”. We have a spray bottle in the van for daily picnics.