I was helping my friend a little bit with these cars. I did only the boot on both cars, right and left back fender on the A4. The rest did my friend as I had to leave, but came back for some pictures just in time when he finished 
Audi 100 -88
Nice lookin red huh?
After some polishing and the paint turned out like this
Audi A4 -97
Process
Wash: Soaked with heavy alkalie. Tar remover was used under the waist. Single bucket and cherry foam from Allbrite.
Polishing/finishing: Menzerna PO85RD3.02 with polishing pads, Menzerna PO85RE5 with polishing pads. All steps with Toptool. Followed by a IPA wipedown.
Protection: Audi 100: cant remember since it was my friend who sealed this car.
Audi A4: PPS]

Audi 100 -88
Nice lookin red huh?

After some polishing and the paint turned out like this






Audi A4 -97






Process
Wash: Soaked with heavy alkalie. Tar remover was used under the waist. Single bucket and cherry foam from Allbrite.
Polishing/finishing: Menzerna PO85RD3.02 with polishing pads, Menzerna PO85RE5 with polishing pads. All steps with Toptool. Followed by a IPA wipedown.
Protection: Audi 100: cant remember since it was my friend who sealed this car.
Audi A4: PPS]