I'm not looking for big holes or clean spots as such, just a drop every time and a tiny amount of pull back and you're fishing. In my mind at the moment I'm not looking for clean spots anymore, if only to avoid and find the drops in weed nearby.
Every venue is different but I think on lower stocked venues with wary fish clean spots are treated with extreme caution and hold little natural food e.g. gravel spots. How many people pick the same obvious far bank markers, find the obvious clear spot, pile bait on it and are surprised when nothing happens, wheres the natural food, wheres the thickest weed, what are they showing over?
I'd rather set up and watch all day for them to show me where to put the traps than rush in crashing leads everywhere, not always possible I know but once you've seen them feeding in an area you dont have to wait next time as everything is written down and measured up.