Thank you for the question.It is actually a
very thin coating on clothing that makes it
stain-repellent. It is possible to buy
stain-repellent sprays, such as Scotchgard, which
you can apply to most fabrics. Unfortunately,
companies keep the exact materials secret, so it
is difficult to say exactly how the sprays work. I
know that sprays often contain Teflon or
polyurethane, as these substances are
"hydrophobic," which means that they repel
water. This is why many cooking pans are coated
with Teflon. Typically, the hydrophobic materials
exist as tiny particles mixed in a liquid which
can be sprayed.
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