I have a rental property with vinyl siding. The siding is white and
is about 5 years old.
There is a light brown stain forming near the the outside light
fixture. Not sure what is causing it.

Any ideas on how to remove this stain and prevent it in the future?
I've tried Ajax with no success.

Thanks,
Vin - Menotomy Vintage Bicycles
http://OldRoads.com