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If the marvin aluminum clad windows hardware rusts due to oxidation, the aluminum rust can be gently scraped off with a knife, washed with soapy water, wiped dry with a dry cloth, and polished with a dry cloth after waxing oil, it will be more smooth as new. Lubricating oil can be used to lubricate the rotating, sliding and locking points of the hardware every half a year. After dropping the lubricating oil, it can be opened and closed repeatedly for 3 to 5 times to ensure complete lubrication and increase the flexibility and service life of the hardware rotating mechanism.
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