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One of my really good customers is a historic Church in Apalachicola, which is about 2 hours drive from my house. This organization & its members is responsible for THOUSANDS of dollars in business to me annually, so when they call, I jump.

Church just bought this residential home and turned it into the church office. I had a very short window to do this job and it was raining on the day I made it to Apalachicola. Not very convenient to pack up and return another day after an investment of time, fuel and labor, so I decided to try out cleaning anyway.

I was delighted with the results of the cleaning, it did just fine with wet shingles. I waited until the eaves line quite steadily dripping rain water, then would spray, then a short downpour would come and I would stop and I'd wait a little longer and pick up where I left.

Process took much longer (2 hours) due to stopping and starting. Used a 40% SH mix and one gallon of Green Wash. Used 60 gallons of solution total ( made 75 gallons, thinned the leftover down to 15% and softwashed the house).

Roof was sprayed twice to provide these results. I'm just happy to know roof cleaning on a rainy day is now an option.

One thing I did notice is that the hotter mix with green wash ERADICATED the lichen, it simply rinsed off with the hose. Don't know if this was due to GW or just my overly strong mix, but I liked the results.