I know some of you may already know about this....
if you ever cant wash you car at home and want to give it a quick blast over with the pressure washers, at morrisons where you pay so much for so many minutes and they give you a code..
and if theres more than one pressure washing machine when one runs out drive in to the next one enter the code again and you get your minutes again
so you can soap down with one and wash off with the other!
I know this used to work as ive tried it before last year not sure if it still would, give it a bash and leave a note!
maybe you could even go to another morrisons, enter the code again and use that, who knows, (i think the code is only valid for one day though)