I must confess, the day I got married, I used the chaps by the Weedon Rd Sainsbury's to do the GS (they've since closed down as the site is being developed).In Northampton, £5 for outside and another £3 for hoover, windows and wipe over of hard plastics etc. £8 if it is SUV or larger car. You QP boys will probably be paying the extra!