I'm not at JB but I have gotten into arguments with MX over this very issue. Basically the plane smells like the strongest musty socks smell you could ever imagine, where your eyes are burning... and the guy is like "i don't smell anything." I'm like hey a-hole, 3 of us can smell this, I can replicate it...and you don't smell anything, maybe someone else should come out because we're not going. Ultimately I've caused 6 engine changes and counting because of this issue (always call and follow up).
ALPA is very weak on this issue, nothing on their webpage, no emails about this new Cabin Air Safety Act...which the flight attendant unions are all over, go figure.