I have seen this discussed elsewhere, but I cannot remember where, so I thought I would start a thread here. After some prolonged wear, VFFs can get mighty funky in the smell department. Regular washing (of both the shoes and your feet) helps, but I find that the smell does not go away completely. I am going to try white vinegar in the rinse cycle of the wash and see if that helps, or maybe just a post-wash soak in a diluted vinegar solution followed by a thorough rinse in water.
What are others' tips for dealing with the VFFunk?