I tried cleaning this myself with no success today (Monday, Dec 2nd). I assume GPC can do it, Well, I'm hoping GPC will do it.

This sign is maintained by the Pima County Library I forwarded this over to them. I will resubmit it to them. This is not a City maintained sign.

As of Monday, Dec 30th this is still there. I wish I knew how to clean these without defacing the sign.

This has been outstanding for 61 days so I'm going to close it even though it hasn't been cleaned up.