Biocide on its own usually takes around 3–6 months to kill moss and algae, with the growth gradually washing away in the rain. Steam cleaning gives instant results, and when followed with biocide, your roof stays cleaner for much longer.
Biocide on its own usually takes around 3–6 months to kill moss and algae, with the growth gradually washing away in the rain. Steam cleaning gives instant results, and when followed with biocide, your roof stays cleaner for much longer.