Use a weak solution of Clorox or equivalent. Depending on what's mildewed, you might want 5% or up to 10%. As always, check in an inconspicuous area to see what it will do. If the material looses too much color, you might want to use something else.
Get a new one.
The mildew smell is probably from your carpet not drying. Shampoo the carpet again using a product that removes mildew, making sure that you remove as much woisture as you can.
Spray Lysol into the fresh air vent near the bottom of your windshield. This will kill the mildew.
I found this tutorial "How to Remove Odors from Your Car" that may be of benefit - see relevant link below .
Depends on what the smell is? Can be many things including mildew or mold in the HVAC system.
It can be a sign of mildew or mold.
Try boiling a few pots of water with vinegar in it, that should help
you must find the mildew or mold source first- you can't get rid of the smell if you don't know where it is coming from- if it's drywall i have inserted a ehow link- http://www.ehow.com/how_2056875_eliminate-mold-from-drywall.html you may need prfeesional help if you cannot locate it yourself- check for water damage and go from there Suggest you find where the mildew is located and remove it. One place to check is the A/C drip pan and the A/C ducts. If in A/C Ducts, need to clean or replace them. Also, look on line for mold and mildew remediation techniques.
The holes allow the smell to escape and so the clothes will not mildew.
change the cabin filters
Mildew or other fungus growing underneath it.
dont take big dumps