I do not want to waste bandwith posting what we recommend if you are committed to trying to get the x jet to work but just ask and i will post what we currently suggest for new roof cleaners to use.
Using a x jet for roof cleaning.
For under 300 dollars you can be up and running with a roof cleaning set up hose pump and all.
Of laundry strength liquid chlorine bleach and water.
The x jet nozzles are affordable.
Use a sprayer attached to garden hose that s filled with equal parts chlorine bleach and water.
Aqua jet make it clean.
This is the best way to clean a roof if you have asphalt.
Don t clean your roof when it super hot out in the baking sun.
Check with mark at easy clean he probably sells them he is on this board and will probably chime in.
It is not expensive to get into roof cleaning at all.
Use a three gallon pump sprayer use one gallon of sh and two gallons of water h2o add about 4 oz.
Yes you can do it with an x jet.
Some contractors when working on residential flat work like driveways and sidewalks will use the x jet nozzle to broadcast chemicals across the surface.
Of liquid dish soap and spray from the roof top working your way down.
This gives it great cling to the surface during.
Use a pressure washer which can loosen shingles and seriously damage your roof.
We use our house roof was h and the soap mixture gets a little foamy when applied with the x jet nozzle.
Concrete adding a moss killer industrial not diy store is still only going to prevent moss coming back within 18mths 2yrs.