How to clean exterior finish that’s been sitting in the sun for years

[awryexperiment]

Do you have access to a polisher or willing to buy one (even a cheapo HarborFreight)? Add a few foam pads (flat or waffled). Amazon sells a ton for ~$40-$50.

If so here are my two go-two products for paint restoration:
-3M Rubbing compound # 05954
-3M Polish # 05996

if those are too pricey or too much volume, then you can choose some consumer stuff at Walmart (megiars, Nufinish).

You definitely need to do a good wash/scrubbing to remove grit/debris before compounding/polishing. Start somewhere aware from eye-level and go slow.

If you were local, I'd show you how. But you'll find a method that works for you.