Regal 3300 Owner's Manual page 253

BOAT
Contact your Regal dealer for all winterization procedures for your
boat. Failure to properly winterize your boat may cause damage to
the boat and engines that is not covered by Regal warranty or the
engine manufacturer's warranty.
Check hull bottom for any fiberglass damage.

Inspect anodes on engine, transom, drives, tabs and other

underwater gear. Remove any corrosion with sandpaper or replace if
deteriorated.
After cleaning apply a coat of wax to hull and deck surfaces.

Pour a pint of 50/50 antifreeze into bilge pump.

Drain the fresh water system if equipped.

Pump out the waste holding tank if equipped.

Never block up boat bottom. It may cause structural damage.

Remove batteries. Use a trickle charger as needed.

Remove all loose gear and electronics from boat. Inspect all

equipment for wear and damage. Store in a clean, dry environment.
Remove drain plug. Clean drain plug hole of debris as needed.

Enclose drain plug in plastic bag and tie to steering wheel.
Make sure bow is higher than stern to permit proper drainage.

Clean all upholstery and store so it breathes.
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https://www.boat-manuals.com/
Storage & Winterization
9-3