We've always found that decking does seem a bit 'slimy' underfoot after winter - though that could be partly down to our location on the north said of a hill where the house and area doesn't see the sun at all for 3 months.
However, a good going over with a pressure washer is certainly very good at lifting said layer and making the surface ready for a coat of stain. We use Ronseal (though other brands are certainly available).
Hope that's of help !
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