Frog Repellants -
Longevity of Natural Repellents Repellent Method [ 1 , 2 , 3 ] How Many Days It Lasts Key Limitations Vinegar Spray 1 to 2 days Evaporates quickly. Needs reapplication 3 to 4 times a week . Coffee Grounds 2 to 3 days Loses acidity as it mixes with soil. Winds can easily blow it away. Salt & Baking Soda 5 to 7 days (Max) Lasts longer than liquids, but loses all effect instantly if it rains or if you water the lawn.