trying to finish up my AAR to sell.the rear end is out and K member.I've started to wash the underside with kerosine.come to find out under the grease is the red and gray dip primer.the car had a trunk pan installed and the rest is really clean.there was black paint that was on over the primers, the center hump back to the area over the axles .I was told they never painted them, so i washed it all off.now all that is left is this dip primer.should i paint the underneath or live it the primer and pressure wash off with some type of grease remover.(grease lighting).I dont want some one to think im hiding anything, but i want it to look good. Any help??