Powerwash. Then just let it age or put a layer if clear ronseal over the top.
for both panels and decking?
Yeah. Blast it all! If it starts to look like that again in a couple of years, blast it again.
Start with the panels and work your way down to the decking. How good is the drainage up there?
@rogan started
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Powerwash. Then just let it age or put a layer if clear ronseal over the top.