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My son poured baby oil on my iPhone 6 and the screen started to get dark clouds. I went to a repair shop, but the technician said he can’t open it because he is afraid he might break the LCD screen. Please help.

take it to a better repair shop, if a so called tech can’t take the screen off an iphone 6 without breaking it then theres something wrong. the lcd could be damaged anyway in which case it will need replaced