2003 Mercedes Benz 320e window washers

Window washers not working I refill the tank and tried looking for fuse but not in fuse box at side of steering wheel, where else would it be, or what else could be causing this problem. And this is the first time I have come across this problem I have also checked fuse box in the boot and couldn't find it and not quite sure where else they could be.I have had the car for a year and this is the first time I have come across this problem.