I use something called "Moss-X" (?); it comes in a green can similar to Ajax
detergent and is commonly available at Home Depot and Lowes.. I think they
also make a spray version.
The stuff works quite well, but takes a little while to kill it all off.
Once you have it all killed, you can install a zinc strip along the roof
ridgeline. It is a sacrificial strip, and will slowly leach in the rain. It
does a lot to keep moss from re-appearing, although you'll still need to clean
the roof on occasion.
>I live in the pacific northwet and get a lot of moss on my composition >roof
>in the slots between the shingles (see picture in link). A pressure >washer of
>sufficient power is effective at removing this stuff but I >don't like to use
>one as it accelerates wear on the composition shingles.
>Are there effective moss chemicals that will breakdown the moss to the >point
>where it can be brushed out of these slots with a stiff >brush/broom, and then
>use a blower or low pressure hose to wash the >debris down the roof?
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