Hi Conor,
thanks for your reply, when you say detergent just an off the shelf household one?. Should I dilute theta with warm water and scrub and brush with that?.
why not jet wash? Too powerful?.
ok stain it is. Yes currently is a unfetching borne colour but a lot of stuff round here is (fascias etc) is there a certain product to go for or avoid?
also regarding changing colour will that go straight on top or would I have to sand back?