I continue to be impressed by the 3m automotive products.
Years ago, I had a dark green 1967 Mustang GT Fastback (yes I wish I had never sold it!) and it had the lower side white GT decals. They had been on the car for years. Short of sanding them off, nothing seemed to work.
Someone told me about the 3M decal removers saying it works great AND doesn't hurt the paint. The decals came off just as promised, easily and the paint was fine.
Recently in trying to restore the paint on the project 190, I seemed to not be able to get all the clouding out. I had used several products, several times. I bought the 3M polishing cleaner (pricey at $10 for the amount you get) but it did the trick in one application and left a wax protection as well.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)