Colourbond sheeting (powder coated steel roof sheeting), and concrete tiles, never seen a asphalt shingle roof in person.
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Yeah, that’s what the shed is, colorbond - so you use have to pressure too because softwashing doesn’t move it.
Speaking of pressure, what do you run your rotary cleaner at for the roofs @steve076
2500psi
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The amount of bad info in the last few posts is depressing
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I’d like to place a bet on more than 5 lawsuits/insurance claims eventually being caused by the information shared so far.
Let me just clarify, I live in Australia, so does @anon26752184 the information I provided was ONLY for homes constructed in Australia.
Like I said our roof constructions are COMPLETLY DIFFERENT, the roof surface is made to last the life of the house.
I understand that you are used to what you are used to, TBH when I did my knee and had some time off I started watching those reno tv shows I honestly could not believe how houses in the USA are constructed.
It was very different to here.
I don’t care what y’all do. You are not in my country. But, metal is metal and tile roofs are tile roofs
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It is the way it is here, concrete roof tiles manufactures care instructions say to pressure clean them, the colorbond manufactures doesn’t say not to…
49/50 roof cleaning companies in Australia Pressure clean roofs. We do not have single roofs, we do not have plywood under the roof sheet/tiles.
A 2% mix doesn’t do much on steel sheeting that hasn’t been cleaned for 20 years (2% is all you can use on the powder coated steel sheeting according to manufactures care instructions). Metal roof would imply some type of alloy, our roof sheeting is 100% steel 6-8mm thick, and where I live most houses are constructed to CAT3 cyclone standards.
You have to do what you have to do to get the job done, If I was to use a 2% mix with pressure and cause damage my insurance company would pay, if I were to use a 4% mix no pressure and cause damage, I exceeded the manufactures instructions and would likely not be covered by insurance.
This…
Hey @Innocentbystander can you clarify what’s bad info please? I understand you don’t care about what goes on in Australia, that’s fine - but with people talking lawsuits and insurance claims, I’d like to know what’s been said here that can generate 12 people liking your post - what’s everybody agreeing with?
Cheers 
I think IB has seen many a roof damaged by using high pressure and/or surface cleaners.
I dont recommend using them if you are not experienced at recognizing surfaces that will be damaged by pressure.
I understand about using surface cleaners on roofs because I repaint them.
My goal when preparing for painting is to remove all loosely adhering material so the paint can stick.
On jobs that are not getting painted after cleaning it is risky to use pressure because oxidation is easily disturbed on aged colorbond .
Not impossible but risky.
The more I learn about chemical applications the less I need pressure I’m finding.
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Chris what does this… mean?
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“This” = “This is the answer I would have given” 
If you have something that’s working for you, don’t change because of what some redneck from Southern United States thinks m
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Chris thanks for clearing that up. Still getting used to the way this forum is set up.
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@Innocentbystander you said you thought it was bad info - I was asking what info you thought was bad, that’s all.
Guys, using surface cleaners on roofs, non-asphalt shingles has been done forever. Still plenty use pressure in the states. Mosmatic has been making a special surface cleaner just for roofs for years. Pretty common in many parts of the world. Just because we do it different doesn’t make us right on everything. Homes in many parts of the world are still built to last for generations.
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Not here in Atlanta…I swear if a house is built pre 1970 it’s a relic and no one wants it.
That, and they only build them to last a few years now. My house was built in '95 and every day something’s falling apart. Doesn’t help it’s got the old LP composite siding that soaks up water like a sponge.
Yeah, the LP composite siding was crap. It had to be installed perfectly just to last 10-15 years. Every house in our neighborhood has been resided.
