A bleech dip or a dip in Potassium permangenate will kill all critters in the plants that we don't want. I personally think they are a pain in the neck. I had Skunk botia loaches to control mine but would rather not have then. I have fresh water limpets now and they are fine. Smaller and reproduce slower.
I will have to find the bleech dip recipe. I think it is 1 cup on 1 gallon fo water for 3 minutes.
As for the PP, I have never been able to find it otherwise I would use it instead. Safer for plants, no needs to treat with dechlor afterwards.