If the mustiness is the result of moisture, find the source and correct it.
From the dallasnews.com
It can remove mustiness from furniture drawers, kitchen cabinets, etc.
From the dailyherald.com
I prefer the latter for its rich, toasty flavour and agreeable mustiness.
From the guardian.co.uk
There's none of the mustiness usually associated with vintage shops.
From the theepochtimes.com
Using a dehumidifier during the summer should control the mustiness.
From the dailyherald.com
The best cure for persistent odor and mustiness is better ventilation and moisture control.
From the washingtonpost.com
It's a scent that cuts any mustiness right through the middle with a slice of something strong and modern.
From the tennessean.com
Secondary qualities are what humans perceive such as redness, chirping, heat, mustiness or sweetness.
From the en.wikipedia.org
Today, the Bird Cage Theatre, which opened in December 1881, retains its atmospheric, internal mustiness.
From the washingtonpost.com
More examples
The quality of smelling or tasting old or stale or mouldy
The characteristic of being musty
This generally indicates a corked wine.
A flavour that often occurs due to poor storage or lack of sufficient drying, aging, or overheating. In aged coffees mustiness is not necessarily undesirable.