I've been working with a rotation of 10 echo-e's (half in use, half cleaned and drying) for about two months now. Haven't had to pitch one yet. They've all been cleaned six or more times, and after I've cleaned and dried them for a week, they're like brand-new.
So I don't have an answer for you as regards echo-e's. Check me in a month or two.
So I don't have an answer for you as regards echo-e's. Check me in a month or two.