Give your tank probably five or six gallons of water, four or five bags of ice cubes, and probably a good cupful of the detergent...
The mix isn't nearly as critical as the next step...
Then: take the rig out for a real good sloshy-bumpy-jouncy ride, and get that soapy mixture nice and foamed-up. Let the ice cubes beat the sensors into getting the idea that this'll clean them out really well!
Good luck!