If you have Good pressure from your regular tap you could try a Gilmour foamaster 2,i've been using one for 4+ years and still going great. Never going to be the same as a foam lance but certainly cheaper (and easier) than using a powerwasher each time. Find the foam doesnt cling as long as a proper lance but its more than enough for how dirty my car gets
http://www.elitecarcare.co.uk/gilmour-foamaster-ii-pro-foam-gun-and-free-1-litre-snow-fo.php
That seems good, i've been looking at snow foam for a while. But without a pressure washer i didn't wanna invest.
How can i find out the pressure from a hose?