I use P21S Total Auto Wash but you can use any multipurpose cleaner. Mist the cleaner on to the pad and allow it sit for a few minutes. Blast the pads with stream of water from the hose, squeeze or shake excess water and air dry. That's it. Sometimes a second application of cleaner and light nylon detail brush is need to break up stubborn deposits. You can also hit each pad with a spray of quick detailer as they are drying to condition the pads.
Don't use hot water to clean your pads. Hot water will soften the adhesive backing.
If you have any other questions you know what to do :-)
Brett @ OCD