Well, this is actually something I’ve done before. I’m not sure where I first heard this, but I’ve done this. I’ve done it when I’ve been on my own and I’ve done it when I’ve been with guides. Seems a pretty good idea. If it doesn’t work, oh well, but it certainly is worth a shot, I’d say. It is not likely to actually hurt anything.
Reach down onto the flat, grab a little handful of sand from the bottom, and rub your fly around in it.