To really get your radiator clean be prepared to get to the bottom of the problem. I was tired of the over heat light coming on in the middle of my rides. I was also unable to get to the back of the radiator. I pulled off all the plastic that was in my way and sprayed Purple Power into both sides of the radiator and let sit. After about 3-5 minutes I spayed it out along with a ton of mud and dirt. Be careful with the pressure of the water because too high of pressure will bend the fins on your radiator. Spray the Purple Power on both the front and rear of the radiator and repeat the process until it is clean. MaD