Polyester can indeed scratch car surfaces, particularly when used in low-quality materials. Here are some key points regarding polyester and its potential to scratch cars:

1. Quality of Material: Low-quality polyester, especially when used in items like towels or car covers, can lead to scratches and swirls on a car's clear coat. It's important to choose high-quality microfiber towels specifically designed for car detailing, as these are less likely to cause damage.

2. Microfiber Towels: While microfiber towels often contain polyester, they are designed to be gentle on car paint. The ratio of polyester to polyamide in these towels matters; higher ratios of polyester can be more abrasive.

3. Car Covers: When selecting a car cover, it's advisable to choose one made from soft, non-abrasive materials. While polyester can be a suitable option, it should be of high quality to avoid scratching the paint.

In summary, while polyester itself is not inherently damaging, its application in low-quality products can lead to scratches on car surfaces.

Always opt for high-quality materials designed for automotive use to minimize the risk of damage.

Here are some relevant images that illustrate the topic:

Polyester itself is generally soft and shouldn't scratch car paint. However, it depends on the fabric's weave and the type of polyester used. If a polyester cloth has a rough texture or is contaminated with dirt or debris, it could potentially scratch the surface. Always use clean, high-quality microfiber cloths for car care to avoid any risk of scratching.