Here are two of many threads on the topic:
https://www.camaro6.com/forums/showthread.php?t=484594
https://www.camaro6.com/forums/showthread.php?t=490786
“Glen e” and “KirkH” have some great threads on the topic. I use ECH2O and have been happy with the results. You might want to search the Cosmetic Maintenance section for other suggestions.