What is the best way to kill butterfly eggs on vegetable plants?

Try to remove the eggs, and then spray the leaves with soapy water. Try to spray just the leaves... thats what i tend to do anyway,.. hope this helps...lol

Thanks - how do you remove the eggs? Was thinking tissue? Wet or dry?

I use my thumb.

fingers

Thanks for all your help :)

Check any other brassica you have ,swede etc as they will lay eggs on almost anything related ,I have had to resort to insect mesh to get any cabbage kale broccoli, but they are still laying even on my lettuse and caterpillars can walk..even crawling under the edge of my nets ,they are a NIGHTMARE!

Many thanks for that I'll go out and check all of my veggies!