But, anyone have any suggestions? I just finished WASHING the exterior, I plan to wake up bright and early to detail the outside then tackle this heap of a mess in the inside...

 

honestly... what I would do is mix up some warm dawn water in a bucket and take a rag (junk mf, or whatever) and start wiping it down with a little elbow grease. If that doesn't cut it, maybe a little APC/Simple Green/Purple Power etc. in addition to the soapy water might help. That's where i'd start.

 

at my old work we would use a rag and a 50/50 mix of degreaser and water it would usually take it of if it didnt we would use a soft bristle brush with the degreaser

 

thats exactly what i did, 50/50 water and dish soap and a soft-bristled brush took all that gunk off. also did my vinyl seats as well, it had crud in the little holes in the yinyl. looks good, but had to stop, it just started pouring outside.