sentence: An asphalt-tiled roof is shown with leaves and green all over it, and then we see it clean. sentence:   Once again we see a moldy, leaf covered roof, and see it clean. sentence:   Mold is growing on the siding of  a homes, which we then we see after being pressure-washed. sentence:  Bare wooden surfaces of shelving is shown, and then we see the improvement as is is covered with a coat of white paint. sentence:   The improvements after cleaning and paint are impressive.