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Here is what I did and my boots are as good as new. 1. Spray Windex (I used the Target version) all along the zipper and pull the zipper down to the bottom, the starting point. You might have to really muscle it to get it to go up or down. 2. Smooth a fragment of candle wax along the zipper.(Just to be sure.. Spray Windex (I used the Target version) all along the zipper and pull the zipper down to the bottom, the starting point. You might have to really muscle it to get it to go up or down. 2. Smooth a fragment of candle wax along the zipper.
1 Ask your auto supply store for the correct application or check your car owner manual.  Disconnect the spark plug wire from the plug. Do not yank by the wire like you're extracting carrots from a garden, but by tugging on the boot. If the boot resists, try twisting left and right to loosen.