This has been dispatched to our Parks Department also.

Mr. Parker, has this issue been resolved?

Per the Parks Department, they tried two separate products on the stains including the one that you suggested and it lightened the stain but didn't take it away completely.

Why was the issue closed if the stain is still there? It may be that the affected section needs to be replaced. Also, what steps were taken to make sure this doesn't happen again?

Bremerton Guy, the above information was all that I was provided by the Parks Department. You can contact them at 360-473-5305 for more information (ask to speak with Tom). Thank you.