Everyone knows that the main shortfall of carpet is that it accumulates dirt and is harder to clean than hard surface floors. But carpet manufacturers have been working for decades to limit this problem.
In the 1960s, they took a big step when they introduced polyester, a far more stain-resistant fibre than nylon. But there’s a downside to polyester, it is not as durable and does not have the lasting power of nylon. So for decades, it became a toss-up between the two — either buy nylon for its durability, or polyester for its stain-resistance… until the early 2000s.