An initially delicious, then unpleasantly mousey Pet Nat in China, and a mousey low-SO2 red in Moldova, gave me the excuse to share this excellent piece on the subject by Simon Woolf

Low level brett acceptability *may* be debatable

Mousiness is not https://www.themorningclaret.com/2017/are-natural-winemakers-in-denial-about-mousiness/

I am pausing to gather more factual information before responding...