You've probably thought you heard it all about help with stains

[lathehand]

I have a 77 V the finish is getting kind of porous so it's getting more an more difficult to get satins out.Here is what i think is a new one for the books Caterpillar s!!!t one speck and a drop of water and you have a stain the size of a dime on what ever it's on after it dries.Everything I've tried so far won't begin to touch it.Some of the things I've tried is greased lighting and the pressure washer, soft scrub ,Mr clean erasers,steel wool.It only lightened them up but there still very visible.Can anybody give me some ideas to try other than a repaint.BTW this all went through the tarp I had a over the boat.