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How to whiten plastic gas tank

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I am working on a 1989 yz250 basket case and the tank which at one time was white has become tan from the gas fumes. I was thinking about throwing it in a tub of bleach but thought I would ask before I did so. Any help would be great!

Thanks.

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I have used bleach white tire cleaner and laundry bleach on my white plastic with no graphics before for just for normal cleaning. Don't know if it will help your case, but it didn't hurt the plastic.

If the gas is soaked through over the years from the inside out, it may not help. A cheap try though.

You may want to spot test a small area first.

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In my research on the same topic I found a procedure for taking stains out of 5g plastic food buckets made from HDPE. HDPE is the same plastic used in dirt bike tanks. I haven't used it yet but will shortly as I have a white tank needing whitening as well.

Removing Odors And Stains From HDPE Buckets

Since HDPE buckets are somewhat porous, they can hold odors and stains from foods like pickles or barbecue sauce. If you score a free bucket from a restaurant, try this cleaning routine suggested by USA Emergency Supply. It has worked pretty well for me.

Wash the bucket inside and out with warm, soapy water, then rinse.

Place the bucket outside in a sunny location.

Pour 1 cup of baking soda into the bucket and fill with warm water all the way to the top. Stir to dissolve, then put on the lid, or cover with aluminum foil.

Let the bucket sit in the sun for several days, then empty and rinse out.

Pour 1 cup of bleach into the bucket and fill with warm water all the way to the top. Stir to mix, then put on the lid, or cover with aluminum foil.

Let the bucket sit in the sun for several days, then empty.

Wash again inside and out with warm water and dishwashing liquid, then let dry with the lid off.

From here: http://www.virtualweberbullet.com/plastics.html

I see the baking soda step as unnecessary as it is used to take out odors which we are not worried about. I figure this procedure, along with other external methods of whitening, should get a tank looking pretty good. Hope this helps!

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