In order to stop the eating it is pretty important to know what is eating the leaves. Soap is good for repelling some insects but some soaps are also really bad and you won't want them on your plants. There are hundreds of home remedies for repelling or killing insects that have been developed by gardeners before synthetic-chemical horticulture became normal. Pictures of the bug or the damage would help.
Don't do that.
First figure out what bugs you have, then figure out what to do and how much to use.
If you DO use soap, you're just trying to smother the bugs, not wash your fucking car.
As CC said, post pics so you can get help figuring out what they are first.