Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to maintain your electric garage door [title] Clean your metal garage door regularly. [substeps] Using a mild detergent and a soft brush, clean your garage door several times a year. This will remove any corrosive chemicals or dirt on the garage door that may prevent it working in top condition.

Ending1: In addition, cleaning it in this way will allow you to see if any springs or hinges need repair. Proper cleaning of your wooden garage door with a mild detergent and soft brush will remove any chemicals or sediment that may threaten to warp the garage door and inhibit its proper operation. Ending2: Install new bolts or screws in your garage door when they begin to wear out. The new bolts might make the screws difficult to install or be too heavy to slide on. Ending3: [title] Make sure your garage door is warm before beginning repairs. [step] You may try a fan, heater, heat lamp, or any other heating or cooling option for the garage door that you can use to help maintain and even boost your garage door's performance. Ending4: Use a soft bristled brush to scrub your garage door. Using a soft bristled brush, gently scrub any dents from the door's hinge, bottom edge, front and back of the lock mechanism.

Answer format: ending1/ending2/ending3/ending4