I've been working to perfect my DW removal. I was using a floating rope which I showed worked pretty good above. I found that if I had lots of DW it would eventually be too much for rope to hang on to. So I invented what I'll call a prickly rope. Here is picture of beginning to stretch it across pond by tying to dock. I was working alone.

Here is picture after I started dragging rope.

Here is picture after having cleaned 1/2 of pond and begin working on the rest.

After doing this twice to get each half of pond she's cleaned up. Worked pretty good but still room for improvement.