For a 40 gallon tank, we use 1/4 cup of simple green, 1/2 tank of water, take it for a ride. Cleans the sensors....does the same thing as Dawn Ultra does with 1/2 the suds. Either one works but don't overdo the amounts as you might get TOO many suds
We use it in our black tank as well. Amazing, the sensors work.
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Richard, Samme and Honor, The Cat
2017 Passport Elite 23RB
Blue Ox ProSway WDH 1000LB
2020 Dodge Ram 2500 Quad Cab 4x4
Reese M-5 20000 Lb 5th wheel hitch
Also in inventory: 2020 Big Horn 3925 MLP 5th wheel