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YES I am in the Northwest, YES Ive tried the Applesauce recipe.

Heres what roof cleaning in Seattle is about: Customers call us out here when their roofs look like their gardens. Moss growth of 2" covering 30% of the roof is the rule not the exception.

We arent getting calls over aesthetics, we are getting calls from people who are seeing their roofs grow trees. They realize that something isnt right and that this is just not looking good, they deep down know they are going to have to replace that roof if they arent careful or do something, SOON.

The applesauce merely creates a wet mess-picture living in a sauna like enviroment where 40 degrees is normal and rain at anytime is expective. You cover that roof with "sauce" you literally see a sea of white moss spores being NUKED.

Ive had roofs where you didnt see that much moss, get sprayed and turn completely WHITE. White is the color of dead moss.

Without brushing that customer is not happy. My procedure is to brush any large moss areas off and then spray it with sauce to kill the tiny spore seeds left over, the sauce also works wonders on streaks and stains.

The ideal situation would be to wait for summer, so that the wet moss that was sprayed with sauce can dry out and die off and go down their gutters.

Done in the cold months here (from September till March) roof cleaning is more about an emergency then about cleaning, most customers have come thru Home Owners Insurance threatening to cut them off.

I left one job for 3 weeks and saw balls of moss still on the roof 3 weeks later. Sure it was dead but the customer called back complaining that we had had much rain and it still wasnt washed off. I explained that the sun needed to dry out that moss so that it could blow away , which is exactly the case. We get 70 days of sun here a year so it sometimes takes along azz time.

The video on this thread is EXACTLY what I do. During the winter. By adding the love you can see that moss being killed on sight, it goes from green to some popcorn looking chit.

I think you are going to set yourself up for some trouble. When moss is white, it is dead. Brushing it will cause damage to the shingles. Proper explanation to the HO, along with the time frame is what is needed. If you still want to brush, just use a pressure washer and destroy the shingles the righr way. No need wasting time brushing. 

Gary

Agreed. I brushed a roof once that was dropping granules by the boatload, the older the roof the more granule loss, also lighter color shingles tend to lose alot of granule with mechanical brushing.

However this was BEFORE  I started lurking on here.  

The thing is the customer just doesnt take lightly the fact that they dropped 300-400 on a roof cleaning and they still have moss either dead or alive on there.

Also I am quite surprised by the resilency moss shows in staying put, as I said in my previous post I sprayed a house with sauce and came back 3 weeks later and there was STILL moss on there.

The roots of the moss out here hang to shingles like a drowning man to a life raft. I kid you not.

Any thoughts on why, the sauce isnt actively loosening the moss from the shingles?

To have days and days on end of rain and still have the moss clinging. You suggest no brushing-its doubtful any consumer would like to wait that 3-4 weeks for the effective to show.

Ive read quite a bit on here about roof cleaners making promises for future results and how that is not the "way to advertise" as a member of RCIA.