I just cleaned up some white Shimano RX100 aero hoods this week.
Go to the auto parts store and get Black Magic Bleche White Tire cleaner (
https://www.walmart.com/ip/Black-Mag...32-oz/19417551). Clean with a rag or paper towels. Rinse well. If the hoods are too tacky, coat them in talc (baby powder) as necessary.
Here's the after
Before? [IMG]

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