Anyone got one of these Decking cleaners?

Hi all, I have borrowed a pressure washer of a Wiki wirral member (thanks :)) I am cleaning my decking and it is taking a very long time, cleaning inch by inch!

Has anyone got or used one of these Decking Brush attachments?
If so are they any good?
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Yes looks good on the promotion advert. Does anyone have one though? If so I would like to borrow it haha.