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First, check your deck for any loose boards or nails that might need hammering back into place.
Then clean the tree sap off using mineral spirits. Rinse very well, then follow with an all-purpose cleaner and water. Rinse well.
I HAVE PRESSURE WASHED PRIMED AND PAINTED WOODEN DECK WHAT CAN I USE FOR A TOP COAT TO KEEP SAP OFF OF DECK VERY STICKY I USED TSP TO CLEAN DECK IT TAKES AWAY THE STICKY UNTILL NEXT DAY WOULD POLY WORK??
At my old house I had a lot of sap from digger pines. I would hose the deck off and since it was cold water, I would then use a putty knife and scrape it off. Be careful though that you don't gouge the wood.
uhhh...what's fixing boards have to do with removing a stain??
Trees do not loose sap. Material from trees over cars, decks and other things is honey due or aphid and scale exceretia. Control the insects and there will be no problem.
Use a solution of simple green and oxi clean. Let is set 15 minutes then powerwash. Works on black hardwood sap the best.