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hourlyslugger posted on r/mechanics3w
Pyrethrin containing insect killer/repellent or pyrethrin concentrate diluted at It’s what hospital facilities use in addition to positive and negative airflow as insect deterrent. It’s derived from the naturally occurring chemical in chrysanthemum flowers DO NOT APPLY DIRECTLY TO HUMAN SKIN IN LIQUID FORM!! DO NOT USE ON POROUS SURFACES WHERE IT CAN EASILY FLOW INTO GROUNDWATER! You can safely apply a coating to your clothing and then let it dry in place. Once it has dried it will no longer be harmful. Provided you follow those 2 rules you’ll be fine. It sells for ~$20 plus shipping in concentrated form on Amazon and you mix it at 1-2 tablespoons concentrate per quart of water.