Using this outer door moulding is a breeze. First, make sure your washing machine is unplugged to avoid any electrical hazards. Then, carefully remove the old outer door frame from your Bosch Serie 4 front loader washing machine. Take your time to do this step, so you don't damage any other parts of the machine. Once the old frame is out, simply place the new moulding in its position. It's designed to fit easily, but make sure it's properly aligned. If you find it a bit tricky, you can refer to your washing machine's user manual. After installation, plug your machine back in and you're ready to use it. As for maintenance, regularly clean the moulding with a soft, damp cloth to keep it looking good. Avoid using abrasive cleaners as they can scratch the surface. If you notice any signs of wear or damage, contact us right away. And remember, if you're ever unsure about the suitability of this part for your machine, always reach out to us with your full model number before making a purchase.