This is what I use. Don’t know if you’ve tried it.
I’ve used TFR but was never really sure about correct mix ratio, rinse TFR off promptly, something about prolonged exposure not being great for tubes/adhesive.
The ribshine rib cleaner works really well, after lockdown my boat was destroyed by seagulls but a couple of goes with this and elbow grease brought it up really well. Then apply Aerospace 303 (Ribshine also have a polish product) and you should end up with a great finish.