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Bear in mind although DW is brilliant, there are some things that aren't too obvious (IMO).
Using the clay bar and detailing spray is, maybe a once a year shot, not constantly. The only reason for claying more regularly is if your car is parked in an area that is overly dusty - parked under trees for example when you might get problems with tree sap or in a dusty and damp place where your paintwork is more likely to suffer from airborne contaminants.
Correction: if you look at your clean car under bright sun-light or under the lights in a petrol station you might see shading in your paintwork where an area - or a streak, doesn't look as clear as the rest of the paintwork. These are marks and scratches in the lacquer coat and machine polishing has the effect of removing a couple of microns of the top coat and thereby removing these marks. Filler type polish such as Autoglym SR fills in surface scratches and makes them less likely to reflect bright sunlight but the filling goes away after a number of subsequent washes and the scratches return.
The most important point for you is "WASH-MITT - throw any sponges you have, in the bin. Meguiars wash-mits are some of the best.
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