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Jo Jo wrote:

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  I am also concerend with the metal roof getting slippy from watering it down. Bucket rental is out of the question, any thoughts would be great.

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 If you get any roof cleaning mix on the metal roof, it will make it slick as ice. What pitch is the metal roof? I think anything over a 3/12 pitch and I'd be pretty worried about the plywood slipping out from under you.

If the metal roof has a standing seam on it you can attach vise grips or bar clamps to the standing seam, you'll need two total, spaced however far apart you feel comfortable with. Now you have a stop to rest your plywood or a 2x4 layed flat against to use as a kicker to hold the ladder in place. If the roof does not have a standing seam and is flat, we sometimes use window carrier suction cups to stick to the metal roof and lay our plywood against them. Over the years I have done a lot of siding installs over metal roofs and this is how we tackled some of them. I can tell you I cleaned the roof shown below which you can see the metal roof there and it became way to slick to stand on as soon as the mix hit it. Water is one thing, but as soon as that surfactant hits the roof it becomes an ice rink.

I'd treat that roof from the ground.  

If there's any growth on the standing seem roofs, I'd use a brush if/as needed on an extension pole from a step ladder.  Like the man said above, where there's a will there's a way.

Let us know how it works out?