What's the best opening for removing branch stains from my deck? I built the deck in the jump down, it got covered...

I built the deck in the jump down, it got covered beside leaves over the winter, got snowed/rained on, and presently it needs to be cleaned and stained.

What is the best road for removing leaf stains? Thanks.
Answers:    My husband power-washes the entire deck for a uniform cleaning. But beware! If you hold never operated a power-washer, it can be a bit tricky to master. There are horror stories of first-time users who hold accidentally etched a hole in their siding by adjust the water spray to High--too soaring. There are lots of services at this time of year that will power wash, stain, and apply a protective finish to your deck. If professional, they will wear protective gear (masks, etc.) and do a moral job. Depending on the size of your deck, it could cost anywhere from $250 and up, however.
P.S.--You can rent a power-washer from Home Depot or other equipment-supply rental shop.