Eagle One has recently introduced their Bucket-Free Car Wash; Essentially concentrated soap in a spray bottle, Eagle One is following Mr. Clean's lead in eliminating the bucket that is usually necessary for washing your car. However, I have found that a bucket of soapy water is still necessary while using Mr. Clean's AutoDry; The water/soap mix is not adjustable and the car never quite gets soapy enough without help. Eagle One's approach is a good one, as obviously you are in control of how much soap to use. According to Eagle One, "only 1-2 sprays per panel/section are needed," and this is largely accurate as even that seemingly-sparing amount is enough to build up a healthy lather.
Missing from Eagle One's approach is the means to avoid manually drying the car after the wash. The soap lacks the "Dry Rinse Polymers" of Mr. Clean's AutoDry, and letting the car air-dry will produce water spots. Washing the car with the Eagle One soap, then rinsing it with the AutoDry's filtered water seems to be the ideal solution to a quick, effective manual car wash.