My boys have one of these in the garden
http://www.activitytoysdirect.com/pr...productid=118a. It is
starting to get covered in a green algae type stuff, presumably due to it
being out in all weathers. What is the best way (and product) to clean it
with? I have a hose pipe and spray guns, a pressure washer and a scrubbing
brush!

Cheers

John