We have not gotton a letter (as of yet) and I am sorry that I cannot offer any companies to use.  
 
Quite frankly I find it rather stupid to have to clean roofs off, in the middle of winter or at all for that matter!  The ones who are writing these letters up cannot even enforce the rules for other violations that others have gone years without having to comply with and they expect us to jump up and down during the rain, wind and winter cold and clean a roof? Get real folks.  Or better yet fork over some hard earned money that most of us probably do not have to throw away on roof cleaning? Does anyone know what a company charges for this, a couple of hundred dollars or so???? I am over some of these rules that appy to only some and not others. I am just plain over it.  
 
 If we get one, they will have to wait until spring/summer when it is warmer and when I see other issues at hand addressed that have gone by the wayside for a very very sad longtime. We do not have the money to pay someone or throw away I should say on a "roof cleaning"  when we need to worry about high utility bills, cost of gas, food, medical care and so on. We WILL NOT spend the money on roof cleaning versus everyday living.  I mean what is the worst that can happen to you for not complying with the yard cop rules?  Sorry Ted, I hope someone can provide the info you are looking for and wish you well in getting your roof cleaned.