Ok, I cleaned an outdoor patio this morning. Moss on the carpet. Even with lots of agitation, there is still moss clinging to the fibers. Now, here are my thoughts about this job. Perhaps the hot water was able to kill the moss and in a few weeks, the "roots" will release from the fibers and I can reclean it and get the rest off, BUT, there will still be residual "staining" of the carpet. Another thought, and one that really appeals to me, is to spray the outdoor carpet with Roundup. It will kill the moss for sure. A few weeks later, I'll reclean, and the rest will detach. Now, keep in mind, this carpet is now a 1000% better than it was before I started this morning, however, I want this stuff DEAD and gone. Any other reasonable ideas? BTW, I'm sure the Roundup won't hurt the carpet, but it sure as heck will put the hurts to the moss.