but obviously, it helps to know what the "something" is that is attacking your basil. My basil is rarely bothered by insects, which don't seem to like herbs very much. If the leaves are getting largish round holes in the middle, that is more likely slugs/ snails and soapy water spray won't bother them a bit.
Look closely especially at the underside of the leaves, see if you can spot anything. If not, come back at night with a flashlight and look again.
Tell us more about what kind of damage it is showing and we may be able to help you figure it out.