Because of winter and all the crud that comes with it, I have been frequenting the touch free car wash about once per 2wks. Is this doing more harm than good. I started wondering with all the torsion bar cracking noises I experienced with my last ML. Could this very powerful presurised water jets be blasting off lubricants/grease at some locations? Or, are there no unsealed greased points under the truck? I also wonder about the various rubber boots under there - what's the risk?