The simplest way to get rid of the pests is to wash the plants with a stream of water. You'll have to do it every time the bugs, which are probably aphids, reappear.
If you want to use a spray, I recommend a soap solution. Mix 1 teaspoonful of good, pure liquid soap to 1 quart of water. Spray your plant with that 4 or 5 times at 7- to 10-day intervals.
Before you mix your solution, carefully read the label on whatever "soap" you choose. You want to be sure you have a soap and not a detergent. Detergents can burn the leaves.