Karcher Pump Guard – Anti-Freeze Protection and Lubrication Formula for Electric and Gas Power Pressure Washers The Cold Hard Facts - Winter storage can be particularly hard on your pressure washer. Freezing temperatures can force any residual water to expand and damage the pump. Dry winter air also attacks the seals and pistons in your pressure washer, causing them to wear out prematurely. These elements can result in very costly or irreparable damages. Put Your Guard Up - Fortunately, there i