I was crawling around under my car yesterday and noticed tham my rear pivot bolts have a gap betwen where the shock absorber mounts, and the nut that holds them in place. Is it okay to just tighten this up? Will I need to lift the rear end of the car? Its very dirty there also, should I clean it off first? What should I clean it with? Also, my overflow bottle sometiimes ejects coolant. And some of it got on the frame under the bottle. I wiped it up, but there is likely a residue. What is the best way to completely clean this so that the frame and frame coating are not damaged by the antifreeze, or the cleaning? Thanks. Adam