With my somewhat limited knowledge of this issue it seems pretty simple to me. They say freezing kills all the species. I threw my felt boots in the freezer for the night after fishing the Upper Delaware system for a weekend (my wife blamed it on the beer but i assured her i was sober when i did it). Also washed the waders but i bet most clingers attach to some part of the boots little crevices. I need all the help i can get when wading, ended up in the hospital for 3 days a few years ago from a fall….I say freeze the SOB’s….
jeff