Bleach is used at 1 part bleach to 19 parts water. Dip the plant in the solution for 1 minute (for delicate stem plants), 2 minutes for tougher plants like java fern and anubias. Rinse several times in clear water, followed by a rinse in dechlorinated water.
Use 1 tsp Potassium Permanganate in 1.33 gallons of water to make a
good solution for plants or ornaments. Dip in this solution for 30 seconds. Rinse.
Hope this helps :-)
If you have a plant that is very fine leaved, try a small section first, just to make sure it can withstand the solution.