You could listen to the above suggestions, but seeing that this is a jetski, and will obviously be immersed in water, I don't see either of the above lasting beyond half a trip in the wet or beyond more than two weeks while in storage.
Here's the solution:
1. Log onto PristineDetailing.co.za and register an account
2. Locate the G Techniq stable of products
3. Order yourself a bottle of C4 Trim Restorer
4. Then get a bottle of W2 Cleaner
5. Wait for it to arrive
6. Take some before and after pics and tell us how happy you are :rollsmile:
You can expect the W2 and C4 combo to last between a year or two years...
In terms of treating fibreglass, if it's protection that you want, I'd suggest polishing and using a dedicated marine wax. It's specifically designed to be ultra durable against the water.
:thumbs:
Sent from my iPhone 6+ using Tapatalk