Power washer! That's what I use on my decks and concrete sidewalks/patio. It does a superb job, making them look like new. Be careful with the jet spray, it is quite strong, so don't hold it too close to the wood. I rent them from Home Depot. Call around & see who has the best rental price by you.
I'm just heading out to stain my decks. We washed them down last week. Good luck on spiffing yours up too.
Dawn is right, don't pressure or power wash too close to the wood. Hope the staining goes well. I need to stain our deck, but it's much too hot lately. Let us know how your deck comes out after the staining. Have a happy day. Marly
I finally finished staining both of my decks yesterday. I used a dark cedar stain on them this time & they look great. I sure hope the stain lasts for a few years. I hate the thought of having to do them again next year!