Reusing Tulle isolation bags

What do you guys think about reusing isolation bags.  One would think that pollen from one flower would litter the bags completely and then reusing it would still possibly result in an unwanted cross.   Wash em or throw em away after they serve their purpose?  I was also thinking washing them might just tear them apart unless you hand washed em,  and even then its kinda iffy.   I would think just to throw them away, or am I wrong?  
 
A good rinse and dry is all i do. But after a while the sun will kill them. I usually get 2 seasons before the get too brittle.
 
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