Dee,
     Late response sorry.  As you probably saw, the yard sale was finally advertised for last weekend. Good thing I didn't wait.
     Suggestion for your roof.  I used a product called SPRAY AND FORGET  it is precisely that.  You spray it on your roof siding vinyl fencing, and over time it will get rid of the black streaks.  Not an instant clean, (then neither are some of the "professional " jobs I have seen) and depending on how heavy the stains, is how long it takes.
     It is enviromentally safe to animals and vegitation.  It can be applied with a garden sprayer no special stuff required.  A one gallon bottle of concentrate lasted me two years and I did a heavy application.  Three drawbacks. 1.  It is only available at the TUDOR Ace hardware on providence Rd just past Military hwy.   2.  You will need someone able to climb up to your roof to spray it on.  3.  That one gallon is rather exspensive.  Believe mine cost me around $55.
    BENIFITS.  Once I got my letter about stains and replied that I was using this product they left me alone.  Or it could be that I challenged them to prove that the six homes I could see from my porch that were worse than mine got slammed to.
 
   Good Luck
Ken