Boiling water can work if you use enough but ja, it will kill the grass too. Try warm water mixed with dish soap. The soap will film over their pores and suffocate them.
Boric acid pesticides are considered to be fairly safe to use around people and pets. It is said to have about the same toxicity as table salt.
http://npic.orst.edu/factsheets/boricgen.pdf





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, but I am a pro crastinator

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