Recipes for Homemade Flea and Tick Spray, Powder, and Shampoo My Favorite Herbal Flea and Tick Powder. Ingredients. 1-1/4 cups food-grade diatomaceous earth; 1/4 cup lemongrass powder; 1/4 cup ...

Vinegar is not an effective flea killer but can be diluted to use as a repellent. Regular pet, yard, and home care—and citrus-based repellents—are more effective in getting rid of fleas.