Interesting that fiberglass fibers are typically 5-25 micrometers (µm), while asbestos fibers can be 180A to 300A (1 angstrom = 1/10000th of a micrometer. So an asbestos fiber is between ~200 to 1400 times smaller than a glass fiber.

Acrylic fibers are 15 µm to 25 µm. Merino wool fibers are 15 µm to 30 µm. And human hairs diameters are between 20 to 200 µm.

Seems to be a biological limit to the body cleaning system e.g. nanoparticles, abestos