Solvol Autosol I've found to be good on tatty chrome, slightly abrasive & removes the rust & cleans the chrome, apply a decent car wax after to keep the water out. Also worth cleaning & painting the backs to stop the moisture getting behind the chrome.
2018 Mitsubishi Outlander PHEV 2005 Porsche Cayenne S SOLD 2000 Jeep Grand Cherokee SOLD 2010 Mazda MX5 Mk3.5 2.0 Sport Tech SOLD 2000 Porsche Boxster S SOLD 1987 Porsche 944 2019 Abarth 595C