Is there a way to whiten yellowed fiberglass tub surround?

[KyMama]

It's one of those kits that comes in multiple pieces and I guess over time it has yellowed.  I hadn't paid any attention to it until I went to replace the caulk.  When I removed the old caulk it became obvious because the areas under the caulk are still bright white.  I really don't want to replace the walls right now, but it's driving me crazy everytime I clean the shower.   Any ideas on how to brighten the walls so that it's not as noticable with the bright white caulk?  Thanks!

[feather]

Replace your lightbulbs with energy efficient lightbulbs. It's more romantic that way.

[Cabin Fever]

Try using a good fiberglass boat hull cleaner. We've used a brand called, "Star-Brite."

[farmerjack]

Try, on a small spot, spraying wd40, then wipe it off. Have done this on a RV, the cover for the refer on the out side. Cleaned it up good.