Some guys use simple green and a water source with no pressure coming from it to rinse or sponge it off with clean bucket water from what I've gathered. Still though being careful of the areas you mentioned.
I believe so. I haven't tested it, but from what I remember there are no chemicals etc in there to really mess things up. If you're really worried then just use some dawn soap. I know that won't hurt the paint.
Can have a dulling effect if left to sit too long; however, the film it leaves can easily be removed using a claybar or scratchX (or similar).
Simple green works great for loosening up the goo behind badges without much harm to paint / clearcoat. Rewax afterwards though...
If you are just removing mud / earth and not grease, plain old water does wonders :thumb3: Sprinkling as the other responder stated, is one of the most gentle and effective ways to cut through inches of mud / sand / foliage bits.