How do I get potassium out of my favorite high-potassium vegetables?

Soak in water? It is known that soaking potatos helps to take out potassium. Theoretically may be possible from other vegetables but there is no supporting data.
Dietary restriction. Soaking them in water for about six hours is the answer i usually hear from dieticians. You should avoid foods high in potassium such as bananas oranges potatoes. Also avoid salt substitutes and sea salt which actually contain increased amounts of potassium.