a common method is to mix water and bleach, 20:1, and soak your tougher plants for about 5 minutes, more delicate ones for a minute or two, and rinse thoroughly with cool water.
i have heard of people making the solution stronger, but very few living things are resistant to bleach, and soft stem plants can melt very quickly.
i used to use the bleach dip above (20:1) on everything going into my tank, but now I only use it if there is visible algae,etc on the plant(s). Instead I typically just do a very very thorough rinse in chlorinated tap water, and rub all the leaves top and bottom with my fingertips under the running water. new plants seem to perk up and take off faster than after a bleach bath, and i've yet to develop a snail or algae problem from adding new plants.
I *will* bleach dip my anubias on occasion as they're leaves get gunk on them from being such slow-growers and in a relatively high-light tank. rinse them just as mentioned above, rubbing each leaf thoroughly top and bottom in cool water.
Eheim Pimp #171
55 gallon jungle in progress
; Eheim 2217, TurboTwist UVS, Seachem Onyx / Black T-grade ColorQuartz, 2x55w AHS CF, BeverageFactory.com CO2 Regulator with Clippard accessories
"If you ask me, you've got too much imagination. Everything's all loop-de-loops and flibbertigibbets." - Hank Hill