Cleaning up Clear IMS Tank?

Does anybody have any tips or products that will clean up my "clear-transparent" IMS gas tank?

I just bought a used tank... it's not the white, but the transparent type were you can see how much gas you have in it... maybe this is called "Natural" instead of "transparent"?

The tank is dis-colored from gas, versus being all scratched up... is there any way to get this tank closer to the bright white it was when new? I don't know if the Plastic Renew product will do much with this?

Thanks!

IMS's own reply to my question

I just received this email from IMS themselves about my question...

THE TANKS ARE MADE OF A CERTAIN KIND A OF MIXED POLYETHELENE COMPOSITE AND ARE VERY POROUS MATERIAL WHICH IS INTENDED TO LET THE TANKS EXPAND OR CONTRACT WITH PRESSURE OR ENVIORMENT ALSO HELP THE TANK BREATHE AND WAS INTENDED TO DO SO , BUT IN THE DESIGN THE TANKS MATERIAL TENDS TO ABSORB ALL FUEL ADDITIVES OR CHEMICALS USED IN THE FUEL .. SO THE TANK WILL ABSORB THE COLORS AND "YELLOW" THEM UP IN YEARS TIME OR EARLIER DEPENDING ON VEHICLES USE OR MAINTENANCE OR STORAGE .

INTERNALLY : THERE IS REALLY NO SOLVENTS THAT CAN BE USED TO CLEAN THE INSIDE OF THE TANK .. SORRY

EXTERNALLY : WE RECOMMEND USING "SOFT SCRUB WITH BLEACH" AND WATER ,, WEIRD BUT IT WORKS EXTERNALLY YELLOWING IS FROM SPILLAGES FROM FILLING OR OTHER ..

THANK YOU