Funny that this topic turned up, I just washed my Scamp
this last weekend. I was suprized how filthy mine was after sitting under a maple tree for a year, and especially how I never really noticed the dirt before I started pressure washing it.
The High Pressure wand does quick work of cleaning off tree sap and grime.
Putting the pressure washer in a wheelbarrow got it up out of the dirt, made it a bit easier to lug the thing around, and kept the unit cool & dry.(I burned one up because it was not able to cool due to grass blocking it's air vents.) BTW in that photo you can see a bit of "before n' after" as I was halfway done and took a break to shoot these shots.
A pressure washer is a great investment, besides the Scamp, the pickup, and the back porch steps recieved a spring cleaning wether they need it or not.(They DID)
Of course, use caution as it does remove cauking as well as grime, but hey, I feel that what comes off needs replacement anyway.
Now I need shades to look at my Scamp!