While purchasing white haricot beans, avoid pale colored or discolored beans. These indicate poor preservation conditions, which in turn reduce haricot beans nutritional value. If you are planning to prepare haricot dishes, make sure you pick through beans for removing unwanted stones and impurities. Following this, consider soaking beans in enough water overnight or all day long, so as to soften the skin and flesh of beans. Rinse the soaked beans repeatedly to get rid of preservatives (if any).