A拆卸密封胶和钝铁楸。
B用锋利的铲子去除密封胶。
C用钝刮刀刮掉密封胶。
Remove the sealant with a blunt scraper.
Remove the remaining sealant.
Remove all sealant that is around the hole.
Fill the space between the patch and the adjacent structure with sealant.
Remove the oil and the grease with a degreasing agent
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