I've found the best way to get rid of mold in the carpet is to remove it from the car and power wash it. Not only does it get the mold off, the carpet will come out looking fantastic.

Plus when you remove the carpet you can remove all the padding under it and put it in the sun to dry.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.