Yer i think your right about the pressure washer getting under the mushrooms more.
I wash the boat on my own so wash and sqweejy in sections, i use to sqweejy the roof but got fed up of that.
Shampoo ? Hmmm yer that might be better than fairy liquid because i noticed that leaves patches on the blacking like its melted it a bit and it takes off all my wax.
I have just been using canal or water point water on its own and sqweejying.
Lol, omg boaters what they like.
Aww thanks for the link it add's shine too, i will order some.
:-)