Mazda, the Japanese automobile manufacturer, recently recalled over fifty thousand cars from its 2009-10 Mazda 6 model. The company found that certain (natural) intrusions in a vent line could eventually cause cracks in the fuel tank. As mitigation, the company is working on ways to prevent such intrusions.
What kind of intrusions, commonly seen in houses and removed by simple cleaning, was at fault?
[+ Show Answer]
Spider webs.