Will soapy water kill cabbage worms?

Online Answer
You can rinse them off in soapy water and dispose of them, or crush them. Either way, you're preventing more caterpillars from hatching and devouring your garden. Similarly, if you see the caterpillars themselves, pick those off and destroy them as well.
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The most commonly used non-chemical remedy is to spray them with soapy water. You can buy insecticidal soaps but many people make up their own using a teaspoon of washing up liquid diluted in 3 litres of water. The aphids are unable to breath under a coating of soap and subsequently suffocate..
An important property of dish soap is that it has to dissolve easily in water, so it will wash out of the soil quickly with rain or watering. The grass is unlikely to be permanently killed unless you pour soapy water on it every day, or unless you use pure dish soap straight from the bottle for some reason.
Contaminated food or drink The taste of soap is so strong that even a trace of it can change the taste of food and water. A soapy taste in the mouth may happen if a person: eats off dishes they have failed to rinse properly. washes vegetables or fruit in water that has soap in it..
You can rinse them off in soapy water and dispose of them, or crush them. Either way, you're preventing more caterpillars from hatching and devouring your garden. Similarly, if you see the caterpillars themselves, pick those off and destroy them as well.
In your bucket, use the soap liquid to mix up a bucket of soapy water. At dusk (just before nightfall), pour the soapy water solution over the area you think is affected by lawn grubs, as well as any areas close by. ... If there are any lawn grubs, they will have come to the surface.