Ok, i love the inside of my fender and my undercarriage looking clean, but frequent rain & mud almost make it impossible to do so. Is there actually a product that you can just spray and clean itself (or most of it). I have a nilfisk pressure washer, and it cleanse probably 50% of the dirt, i thought probably there is a soap that can do this without going under the car or have myself going through inside the fender and hurt my arm in the process. thanx