How to sand ridged decking?

Felicity asked 5 years ago

Our deck is about 10 years old. It was built and painted by the previous owners of the house and needs repainting or staining.

I would like to sand and stain it but am not sure how to start because the boards are ridged, rather than flat. I think they were laid upside down and that the ridged surface is actually meant to be the underside of the beck.

I hope I’ve explained things properly. Do you know what I mean about the ridged boards and, if so, how would I go about sanding the deck?

Many thanks.

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