Took Discovery II to the usual car wash yesterday.
The guy used a rag with who knows what on it on my heater control lens.
Looked wrecked.

Googled about how to fix it.
Some folks said use a metal cleaner on it like brass cleaner.

I used this metal cleaner that comes on a wick like rag from the autoparts store.

Totally amazed.
Lens is like from the factory now.

Bright clear and clean.

After you polished it down and windex it - is perfect.

 

Maybe post a link of the product you used so others can know what you used.

 

I hear toothpaste with its fine grit will also work well.