WARNING!!! DON'T TRY THIS AT HOME!!!
I don't recommend trying this with a nice glove, but ...
I live right next to a park with a softball diamond in it. Once, after a very heavy rainstorm, I found a sopping wet Rawlings RBG36B lying drowned at home plate. I took it home and let it dry out, but like your glove, it had a definite musty smell, plus a lot of sand and twigs/grass in the fingers. It literally must have been underwater!
I tried cleaning it with saddle soap, but after it dried out again, it still smelled musty. I thought what the heck, it can't get any worse and I have nothing to lose, SO I TOSSED IT IN THE WASHER with Tide and just a shot of Clorox ... I expected to retrieve a ruined glove from the agitator drum, but it came out clean and in good shape! Again, after it dried out, I used some mink oil on it (that's what I had at the time), and it turned out to be a really good glove! I wound up giving it away to a JV baseball player I had on my team who needed a glove.
There is no way that gloves are supposed to be machine washed, but luckily, miraculously, it worked in this case. AGAIN, I AM NOT RECOMMENDING THIS AT ALL! I just got lucky with it one time.
I sure would not do it with a good glove.
Yes, I still have my first glove.