Plant bath?

I hope this doesn't seem like a silly question but I seem to remember
someone telling me that they washed their local found water plants in a
chlorine/water bath in order to get rid of any clinging eggs or larvae
that may be living hidden from view on the plants.
Does anyone know what the best ratio for chlorine/water so as not to
kill the plant itself?
Any help is greatly appreciated!
Thanks in advance!
Craig
Ontario, Canada