When you buy new clothes or even underwear, that it often comes with a tiny Ziploc bag containing about 1 square inch of matching fabric. Most people believe that this tiny piece is provided in case you get a small hole in your clothes and need to patch it up. Well, this is a nice use for the fabric swatch, but it’s only a secondary one.

The main purpose of the fabric is for you to test out your cleaning products on. The manufacturer includes that little sample of material so you can test how different laundry detergents will react to your new garment.

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