Usually once a year I fire up the Gerni and wash down the exterior Hardieplank of the house and the colorbond roof.
I don't use detergent as I've always found that it works fine without it but walking through Bunnings today they had a new hose-on pack and it got me thinking if it would be worth using?
The active ingredient is Citric Acid, which isn't too harsh but then is it not really doing much anyway?
I know Gerni and most manufacturers have some kind of detergent or alternate as well, again same question if it actually makes a difference or not?
What colour?