Silverbullits comments are certainly true, but in VIC we have no choice - Our stage 3 restrictions mean Commercial Car washing only. Not washing at home even with a High Pressure hose. So the only thing we can really do here is use our own sponge/wash mit and buckets, but we still have to use their water. It just means needing to pay more attention to polish and waxing. Since I purchased my car, it's pretty much always been washed at a commercial wash. But my car is given a wax twice a year (In Autumn and Spring) and the duco is all good. But naturally, if I never did this, and used the 'brooms' they have at the wash all the time, it would be a mess!