OP drive around the older villages and take note how White birdcages look dirty, with notable rust in some areas. If mold is removed quickly it can leave stains that never go away. Two houses had White at 14 and 15 yo with regular cleaning still look dingy.
Other two houses one 16 yo bronze has zero color change. The only time I have noticed bronze peeling in bronze cage owner tried to cover up a giant scratch by painting.
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Do not worry about things you can not change 
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