What is the best way to clean an old wood deck? The treatment is long gone from surface,?

When it rains, the deck is very slippery, sort of like black ice.
I want to clean it and do something with it. How about a stain?

Answers:
Try pressure washing with a wood deck cleaning solution. After it dries, apply a wood stain in a color that you like. The stain will help preserve the wood. Home depot, lowe's, hardware stores sell cleaning solutions & deck stains.

Other answers:
Pressure wash it then stain or paint it.
Pressure wash it then stain or paint it.
orange oil
you can buy a lot of great products out there but you can also just buy some orange's
Home Depot sells a deck restoring product you can use on it. Your deck sounds pretty inpacted with fungi, so you may need to apply it a couple of times, sand, or ever replace the deck.
Bleach and water in a pressure washer and then there is deck wash. Then some Thompson's WaterSeal.
bleach is all you need for cleaning. bleach then rinse well. I don't know the best way to seal it.
I had a friend that had a deck in bad shape and he flipped the boards and refinished.
My neighbor just had her old wood deck power-washed by a local company that provides this surface. Her deck looked very dingy and slippery as you mentioned about yours. After the power-wash it looks like it is brand new. I watched the workers do it and I couldn't believe how fast it was done. I have no clue what something like that costs but I am sure it differs from location and company. I am sure if you had the deck power-washed you could then reseal it with a stain.
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