No, Health, you are washing it off with water, and the keili is not separating a mixture. Did you see the halachah in Shulchan Aruch I referred to? P’soles is often subjective, cso for you pesticide might very well be p’soles, but the keili isn’t a factor.
LC, undoubtedly, there are some common mistakes made, but you are correct that not everything someone thinks is a mistake is, and some of these are examples of that.