Well, like most lighter load particles, they do die. Since it is not a heavy load, keeping it clean, rejuvenating or using Dawn helps some and resurfacing helps some. So they aren't gone after 60-80 games. But after 180-200, even with resurfacings and work, you're on borrowed time.
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"I don't mind if you don't like my manners. I don't like them myself. They're pretty bad. I grieve over them on long winter evenings."