Koko posted this awhile ago and I've added the conversions
for myself.
You have different ways of cleaning plants of the nastys

1.
Snail
a Cidewhich has ":potassium permanganate " This will kill any
snails.
Get a bowl with some water add enough that will make the water a pale
Pinkish color. Then soak for 10-15 mins. Then rince with tap water.
2. If you cant find that you can use Bleach.
This way is alittle harder on delecate plants and root system. So you
want to use 1 part bleach to 19 parts tap water. Then only dip them
into the solution but dont get the roots. One table spoon of Bleach to
one quart of water.
1 quart equals 4 cups. 1 tablespoon equals 3 teaspoons.
So far I haven't had any problems with the bleach solution.
Maybe it's just me though.