Pyrethrum and Neem will help rid those pesky Mexican bean beetles....These are relatively non-toxic to humans when used according to instructions...Detergents, as noted will help also...<br />
If these don't work...pray....<br />
Mix a teaspoon of liquid dishwashing detergent with one cup of vegetable oil. Shake it very, very well. Mix that with a quart of hot water. Spray it onto the plants about every 7-10 days. The plant tips may brown slightly, but that is normal.<br />
You can also use some tobasco sauce mixed with hot water. But I think that I would stick with the first suggestion.