disease may be somewhat inaccurate for many issues. harmful organisms may be better. if this is the first time you've heard of such a thing, you owe it to everyone including yourself (and wildlife) to do some research. here in california, the main issue had been new zealand mudsnails hitching rides in felt, watercraft (including float tubes), waders, pets, etc. the problem has expanded to other forms (quagga/zebra mussels/didymo/etc) and it's occuring all across the united states (my apologies, i'll keep this relatively US-centric for now).
here's an interesting read of didymo (rock snot):
aquastealth makes it easier to clean boots but note, the danger goes BEYOND boots.
one of the highly recommended ways to clean waders/boots/small items is to immerse it in a SPECIAL version of formula 409 (i used a large plastic trash bag and buckets in the past). not any of the "kitchen" labeled cleaners, it specifically has the term degreaser/disinfectant on the product and can be bought at a home depot. i don't have a container on me right now so cannot tell you the actual name but studies have shown it is effective in killing NZMS.
these threats are relatively new and studies are being conducted on ways to combat the invasives and decomtaminate gear.
here are 2 links about NZMS from reputable sources. bleach can work too:
a full report of decontamination methods and results:
to not completely hijcak this thread (though, hijacked importantly), check out the new korker cross current, streamborn or guide wading boots with interchangeable soles. aquastealth is one of the choices. their company website offers them down to a size 6, i'm assuming a men's 6.