Driveshaft issues

On the driveshaft, there are spicer dust covers which have felt

packing to hold the grease in. Mine have cork. But the problem is

that both cork and felt compress with age and this allows the grease

to coat the bottom floorboards. So my question is - is there

anything better that will retain its shape, last long and work

better than the felt or cork to hold that grease in?
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