Black Tank No Fuss Flush
I think it's about a quarter cup in a quart of water. I got the sprayer from one of the big box stores. I don't measure, just pour in a bit of unscented Clorox, and fill up with cold water.
I label the sprayer very clearly, because I use a very similar one to squirt the dogs with plain water if they misbehave. I keep the sanitizer one in the TV box when traveling.
Stronger than that tends to destroy the parts of the sprayer. I store the potable water hose with the ends lightly screwed together to keep them clear of debris.
When I'm ready to hook up, I spray the hose connections, ends of the hose, and the campsite hose valve enough to get them wet. This solution will probably bleach clothing, so aim carefully. Not good for eyes either.
The chlorine concentration will go down with time, so mixing fresh solution occasionally is a good idea. You could dump the tired solution into the fresh water tank or use it for cleanup and sanitizing inside the AS as well.
Sent from my pocket Internet using Airstream Forums
'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it