I don't think the Meguiar's APC or any APC will actually KILL mold spores. It will clean and remove them from their home but not completely kill them.
This question comes up from time to time as it relates to convertible tops on cars and the answer is always the safe approach....
Clean first using an approved cleaner for vinyl.
Clean second using a little bleach in water. This really is only for white convertible tops as the bleach could discolor pigmented fabrics.
I'm sure if you do some Googling you can find some products that are specific to what you want to do.
