I usually keep my paths, drive and patios clear of moss and weeds with my "industrial strength" Karcher. I find using it rather therapeutic. Usually twice a year.
However, an elderly neighbour now sadly departed, managed to achieve the same effect on his, with a weak solution of cheap bleach, applied fortnightly with a bog-standard 5ltr garden pressure sprayer.
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"I don't mind if you don't like my manners!
I don't like 'em myself! They're pretty bad.
I grieve over them on long winter evenings."
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