give it time to at least ferment out, you may like the way it tastes, or you may want to age it and see what develops. Ive never been able to capture wild yeast.
As for washing it your can wash it the way you would wash regular yeast, its gonna change over time for sure and youll definately have more than just yeast, youll have the bugs in it too.
primary:15 minute Cascade Pale Ale
Primary 2: Cream of 3 crops
Primary 3: Sam Adams Holiday Porter Clone
bottled:BM's Blue Balls Belgian Wit
15 Minute Cascade Pale Ale
DryHopped Cream of 3 Crops