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I'd suggest that it's bacteria in your clothing, rather than your diet / hydration, unless your kidneys are a bit fucked.
It's persistent, doesn't disappear in cooler washes, and reactivates when it warms up (i.e. when you exercise).
Pre-soaking clothes in anti-bacterial solution can help, as can using it in the conditioner tray when you use a washing machine (because, of course, you would never be using fabric conditioner with sportswear).
Washing with biological liquids help, as does washing at 60 degrees. And a quick blast in a tumble drier.
For what it's worth - ammonia / urea are both soluble in water. A few soaks in a bucket would get rid of it.
Not an injury but a bit weird.
When I was touring this summer I was putting in some big days and not fuelling enough at all. It caused me to start sweating ammonia. I googled and right enough, not enough fuel, not enough water and the body eats itself and sweats out ammonia.
Came home, eating like a pig but still getting the smell of ammonia from my cycling gear. I'm fairly certain I'm generally fuelled enough...although perhaps with a fairly shitey diet at the minute.
Anyone else been there or know what's going on? Anything to worry about?