Something other than Gelcoat

We always discuss detailing the gelcoat .....
What do you Marine guys like to use for the upholstery,metal and plastics?

My sons like 303 protectant for the vinyl upholstery after a deep scrubbing,
but for maintenance between full details they use Meguiar's Vinyl & Rubber Cleaner/Conditioner #57.

For the metals they like Collinite #850 and Flitz.

For hard plastics they like Pinnacle Black Onyx Tire Gel .....I know that sounds crazy..

What do you guys like?

303 is great for the vinyl and rubber. I usually use some optimum metal polish for metals to clean them up and then I will wax them with collinite or menzerna power lock.

Hard plastics I typically use the 303 as well.I have used opti-bond before as well.