WriterAlexis Rust removers help wash off the rust though, they do not prevent corrosion from happening in the first place. So I would not assume they are effective at protecting the belt from corrosion. And with any responsible keyholder, a belt would be removed and cleaned long before any oxide layers would grow so thick that they are effective at trapping corrosive matter either. So I think the only place where surface corrosion matters is the lock, because that could jam if corroded (or fouled with sand).
As for uric acid, the content of that in human urine should be pretty low, it is more common in avian waste if I recall correctly.
And blood, sweat and tears are probably somewhat less frequently found on a belt. Well, I guess sweat depends a bit on whether the belt has a rubber liner (neoprene or silicone, mostly) or not. But tears are generated pretty far away from the belt, and blood... only source of long-term exposure of the belt to that I can think of is menstrual fluid, which would of course depend on how you handle that kind of hygiene... that might actually be one of the more stressful fluids the belt might be exposed to, but I will leave discussing the details of that to the girls - as a male bachelor, I have just way too little experience with that for my opinion to have any merit.
Sexual fluids might also come into play when it comes to body emissions that a belt would be exposed to. Not sure about the chemical composition of that either, though.
