Ensure a clean, dry surface by using a leaf blower or a broom.

If you have a water tank connected to the roof or gutters, make sure you disconnect them for at least 14 days after spraying.

Use a low-pressure sprayer. Dilute the moss and Mould 1:20 (this also depends on how strongly the moss and Mould are present on the surface). So, the stronger the presents of moss and Mould, the less you dilute.

Spray diluted product evenly on the surface and walk away.

It takes three months until you will see some results.