That is great man. Now I know what I am going to do once I get the roof cleaning added to my site. Test like that speak volumes to a potential customer.
NO i used straight household bleach as soon as i get a roof lined up. i will experiment with 12%.but to be honest with you i don't think there will be any difference.
In addition to the experiment, i did not mention, that after soaking the shingle in bleach i put it in the the toaster oven at 110 degrees for an hour. the pic you see is the shingle right out of the oven literally.
dave, great lakes, YES!!! you can put it on your web sit. and that's go's for any other roof cleaner on this fourm...
All i ask of you is to post my link on your web site and i will do the same.
P.S i hope my spelling is readable i don't have spell check on my tool bar yet LOL...