HOW DO I SPRAY A ROOF?
Spraying the roof is a messy job and there's no way around it.

First of all and most importantly is safety gear. You will need goggles in case the wind blows the
Spray & Away back at you. I STRESS wear goggles. A hat to keep it out of your hair. And latex gloves to protect your hands from the chemical.

You can use Spray & Away on all roof types.

Spray & Away is slippery and somehow it always seems to get on the rungs of your ladder, so be careful.
I have slipped off the top of my ladder and miracleously landed on a wheelie bin.

When backpack spraying you are going to have to get on the roof so you can reach to far away tiles or roofing iron. Watch out with the weight on a full pack. Lean forward so you aren't suddenly tipped back by the weight.

Have the Spray & Away mixed at 5 parts water to 1 part Spray & Away.
There's no need to make it any stronger. I've seen Spray & Away clean up lichen that has grown like a forest  when sprayed at the normal dilution rate.

Spray from the top of the roof down so the chemical runs down the roof giving you better coverage.
If the roof also has mould you will note its already coming off. You will see it on your gloves and clothes that have been in contact with the roof.
Try to get in positions where the wind isn't blowing the spray back at you. If you aren't wearing goggles it will sting your eyes.
When you have finished hose of any plants that may had spray on them.

If your guttering leaks, make sure prize plants below are protected.

Clean out your sprayer so it's ready for future use.

Now just wait. The lichen is killed straight off, it's just a matter of the rainfall washing it away. Lichen can take 6 months plus to go, but it will and your roof will look great. Spray every year to keep the lichen away.

If you are in Auckland I have an electric sprayer suitable for a one storey roof. Hireage fee would
be a white wine or two!