So, the first step is to open the door and gently pull the seat belt most of the way out of the retractor. Use a clamp to prevent the belt from retracting back into the spool while you’re working on it. Next, lightly spray fabric cleaner on the fibers and scrub with a medium to stiff bristle brush. Scrub in the direction of the fibers, and avoid circles, or rubbing up and down. Over time and with excess pressure, the webbing may begin to degrade or fray with abuse. If the stain persists, dilute all-purpose cleaner, three to one, in a small cup of warm water.
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Dunk the brush into the cup and scrub the area. Use the minimum amount of cleaner and liquid necessary to remove the stain, and to avoid over-soaking or spreading the discoloration. For belts with strong odors, add one tablespoon of dish soap and two tablespoons of vinegar to one cup of warm water. Then gently scrub the webbing. Vinegar is great at killing smells, and is a natural antibacterial agent to minimize future mold issues. If you access to a steam machine, spray fabric cleaner on the belt and blast the webbing with pressurized steam to blow dirt away and kill germs. Steam is also helpful at minimizing the amount of moisture used and subsequently, the time required to dry.
Lastly, dry with a cloth towel by squeezing the belt between your hands, and running up and down the fibers. Then leave the belt extended overnight to dry. If the belt is retracted and retains moisture, mold and bacteria will grow within the spool, so give it enough time to air out thoroughly. Although most seat belts are made from only 300 polyester woven fibers, they can hold the weight of approximately three tons which is crazy. So, making sure this vital and sometimes overlooked device is cleaned properly is extremely important.