I let them give mine a wash for the first couple of services but at the third oneI I was hanging around for the 'while you wait' and saw the bloke on wash duty drop his sponge onto the yard floor, pick it up, give it a quick dip in the bucket and start washing again. After that, I went inside and told them that I needed to get going so would do without a wash. To be fair though, I never had any problems with the washing on the couple of occasions that they did do it.
