First I'd scrub out this cabinet with a cleaning product that won't affect the finish, probably multiple times. Next I'd leave it open whenever it's not in use/storage. Typically the "new" or unpleasant smells that come from new RV's will diminish over time so anything you can do to accelerate this process will cause the smell to disappear sooner! Good luck.
Days camping (2015)----88 days
Days camping (2016) ---110 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi
30 years RV'ing
12 different RV's