5 "So easy!" Carole 03 April 2021 I bought this after using the regular Wet and Forget for my patio and pots in a previous house. This time I needed the long length spray to get rid of the moss on my garage roof. It was really thick but after a few weeks it has almost disappeared. We had to use a brush to help it along - a bit laborious but It was really thick. I’m buying another bottle to attack other things in the garden.