Alongside the recent feature that Matt Prior wrote about getting 100mpg out of his Audi A2, there was a video that went on Autocar's YouTube channel.
It opens with a shot of Matt at a jet wash, cleaning the A2. Scroll down and, reliable as clockwork, there they are: the commenters lambasting him for ruining the Audi's paintwork by using 'the brush'. Of course, they're ignoring the fact that this is a £500 car whose paintwork is already far from pristine.
