On Jul 28, 1:51*pm, wrote:
On Tue, 28 Jul 2009 08:08:08 -0700 (PDT), Frank

wrote:
May take a long time but rain should help with time. *If it's a year
old, I'd consider sealing it which is something you will probably do
anyway.

Right.

It's only a month old now.

Thanks

Duke

I was recalling time neighbor had ducks and they were cute but crapped
all over our driveway.
Eventually disappeared with time. I think there is a similarity
because birds swallow rocks to grind food in thier crop and it
probably comes out as inorganic debris needing mechanical removal or
washing.