I agree with Gabey. I think if u put two cars side by side, one jus polished DIY, the other by a groomer, u cant really tell the difference. And considering the climate we have, the humidity plus the soot ... any kind of grooming job will suffer in days. Unless u are not keen to DIY, then its alright to pay for labour and pdt costs, but at a reasonable price. Its best to wash regularly, at least once a week, plus use a good wax like Autoglym or Zaino or equivalent range.