Can this be fixed ???

[Nessmuck]

How do you get rid of this black streaking on Ash wood ??? Thanks for any input !!,

 

[pklonowski]

I think folks use TSP-based deck cleaner... search the forum for that.

 

[Nessmuck]

Has anyone had any luck just sanding it off and re- varnish ??? Thanks

 

[Dave Osborn]

Sanding would be a good start...see how much stain that you can remove.
I've has good luck with stain removal using Snappy Teak Nu. It's a 2 part teak cleaner that is available at Jamestown Distributors.