Discover a simple and effective home remedy for cockroaches using cayenne pepper and dish soap. This natural solution repels pests with its strong scent. Learn how to make and use this spray in areas where roaches hide. 7, cayenne pepper and water. This solution is one of the easy home remedies for cockroaches. You can make a solution using 2 cups of water, one-third cup of cayenne pepper, and a tablespoon of dishwashing liquid. Add these ingredients to a spray bottle and shake well. Spray the s