The only problem with the local immigrants is when they drop the sponge they just dunk it back into the soapy bucket and carry on washing, not realising they have picked up half a tonne of shingle! Learnt that the hard way!!
don't use wire wool lol... use autosmart g101 diluted 10:1 with water (10 parts water) if thats not strong enough move onto a 5:1 dilution and if thats not strong enough your exhausts haven't been cleaned in looonnnngggggg time and move onto autosol metal polish.
But give the car a quick snowfoam once a week, clean the wheels and clean the exhausts with G101 and keeping the car clean is no problem and that takes 15 minutes to do lol.