have done about 6 in the last 2 weeks, which have gone ok, but i was just wondering if any of you have come up with any good ideas/short cuts to make this work easier, such as certain cleaning detergant or any ingenious homemade cleaning brushes I pre_soak with garden hose, tap water, then hot water with fairy and scrub a lot rinse off with pure if its a glass roof this works anyone got a better idea.