The good news is that I'm finally done (except for the windows). By the time I finished the interior, I was too tired to do a full exterior, so it got a Color-X x2/UPP wax job (it's a freebie, & they NEVER wax their cars anyway) even so, it made a dramatic improvement.
The interior leather was horrible, & I had to get some Meguiars GC Aloe Leather Cleaner.
This stuff worked really well. It seems to use a strong emulsifying (dissolving) action on the dirt & grime. I spilled a couple of drops on an uncleaned section, and when I wiped them off, there was a definate clean spot. Instead of the recommended terry cloth, I used a medium bristle brush to apply the cleaner. It added some scrubbing action and allowed me to leave a relatively thick layer on the leather so it could work on the embedded dirt. I only had to do this to the seating surfaces, which had more texture. The smooth surfaces came clean using a terry applicator. Once they were cleaned, I used the GC Aloe Cleaner & Conditioner to remove the light dirt still remaining and condition the leather.
The carpets and mats eventually came clean after being scrubbed with Simple Green, extracted, scrubbed again with Woolite (3 oz/29 oz water), then finally rinsed with a 4 oz fabric softener/3-1/2 gal water mix.
Oh yeah, the bad news?...The wife took the digicam with her to her sister's house, and I won't be able to get after pics until "after" the car's been driven through about 10 miles of construction :ticked