Buy a dehumidifier. Rent an ozone generator. Info on my site.
Wash it.
That musty smell could be coming from mold in the carpet and or it's padding, as basements tend to be damp. You could have the carpet cleaned professionally or clean it yourself with a good carpet cleaner. If this is unsuccessful it may be necessary to replace the carpet padding or both the carpet and it's padding.
yes it is a good solution for a damp basement because it helps prevent moisture, sweating pipes, metal objects getting rusty, and musty odors in your basement.
Vinegar
you wash it????
smell it! old original cards have an unmistakable musty basement smell that cannot be reproduced.
The musty smell of moisture and possible water marks would indicate that there is a problem with water.
use soap clean it
Use Fabreez.
spray it with perfume
Basement dehumidifiers are typically set between 30-50% humidity. Aim for a humidity level that is comfortable for occupants while preventing mold growth and musty odors. Adjust as needed based on the specific conditions in the basement.