A method for cleaning an outdoor surface includes combining a first composition from a first vessel with a second composition from a second vessel. The first composition includes hydrogen peroxide and makes up 94-99.5% of the combination by weight. The second composition including at least one of a silicate, a carbonate, a bicarbonate and a percarbonate and makes up 0.5-6% of the combination by weight. The method further includes mixing the first composition with the second composition. The method further includes applying the combination to the outdoor surface within twenty four hours after mixing. The method further includes contacting the outdoor surface with the combination for at least five minutes. The method further includes rinsing the combination off of the outdoor surface.