Your new roof should be inspected at least yearly and cleaned of debris such as leaves to ensure a long useful life. Areas that have become marked may be cleaned using soap and water. More persistent marks may be addressed through the usage of white spirit or car paint cutting compound.
Protrusions such as pipes and ducts should be adequately flashed where they pass through the sheeting surface. Where ribs have to be cut away to permit penetration, additional framing should be installed as required to support the sheeting.