I have heard that plants can be salt-dipped to rid them of parasites, hydra, etc. I have gotten some moneywort. How do I disinfect it? And is it a true aquatic plant? (meaning does it stay submerged all the time)
You can dip it in methylene blue soluation, as that kills most things (but it's also a stain - be warned), or "SnailAway" or a weak salt solution (not too strong). Do make sure to rinse it before adding it to your tank.
I have read that many plant hobbyists dip their plants in a weak solution of 1 part bleach to 19 parts water for 2.5 minutes. This should kill many kinds of hair algae that may be on the plants. I have never tried it.