I just cleaned my first really nice home . About 7000 sf roof very very steep. The roof had real bad streaks and the first thing I did was Hit the worst places first and then started at one corner and worked my way around the house from a ladder .I believe the sh was fresh but some places had to actually be hit 4 times ( only the very worst places) . Is this normal ? The roof came out perfect. When it rains this roof will look new. I used about 100 gallons Apple Cider Sauce. 7 hrs. 1100.00 Homeowner could not be happier. When her next door nieghbor saw this he scheduled his house