I'm not certain about your car, but some of that "chrome" trim might be anodized aluminum. At least some of the trim on the w123 is...window trim, grill trim, badges, rain gutters, etc. It's hard to get that really shiny with off the shelf cleaner/polish/stuff.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)