Introduction
Use this guide to help you replace a cracked, chipped, or worn-out seal for the windshield. This replacement is for the following vehicles: 2005 - 2013 BMW 335i or E92 series. Replacing this requires some tools, but it is relatively simple.
Tools
Parts
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            Please begin using a 90-degree pick and lift the seal from the top corner (either side is fine). 
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            Use both your hands and the tool to slowly lift up the seal. 
 
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            Start pulling off the seal with your hand slowly to prevent the seal from cutting off. 
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            If it cuts off, use a small flathead screwdriver to remove the leftover seal that is difficult to reach. 
 
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            For the passenger side, you might not need tools; you can pull it with your hand. 
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            If it is difficult to get rid off please proceed to step 4 
 
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            Use the screwdriver to remove any excess rubber from the seal. 
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            If stuck, please use the screwdriver to lift the piece by piece of the stuck rubber slowly. The tape on it might be too difficult to get rid of. 
 
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            Grab your favorite all-purpose cleaner or any degreaser, and make sure to spray directly into all the crevices. 
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            You will also need a microfiber towel to clean the crevices; if they are too tight, please use the 90-degree pick to get in between all the cracks. 
 
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            Begin from the corner and begin to push into the crevices. Do the top first for a more straightforward application. 
 
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            For the sides, make sure that the seal clamps up to the windsheild glass, this is for it to stay in place. 
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            Make sure to push in until the seal won’t come off. 
 
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I want to mention that the rear glass seal takes the same steps as the windshield seal. Please follow the steps carefully.