Introducing the "Asda 10 pattern water wand"
http://direct.asda.com/ASDA-10-Pattern-Water-Wand/001670214,default,pd.html
Attaches to your hosepipe.
Can wash under the zed and I was pleasantly surprised when it tucked under the arches too!
My zed isn't lowered and sits on 19's.
If I feed the head of the wand from the base of the wheel behind the bumpers I can blast out the crud in the arches without taking off the wheels or jacking it up.
ALL FOR A FIVER