D.W.
The only part of the mold you can see with the naked eye is the fruiting portion of it (like seeing tomatoes on the vine, apples on a tree). The hyphae are actually like the roots of a tree and may go much deeper into the fabric and are completely invisible to the naked eye (which is why yous should always throw away moldy bread instead of eating around it)
From a safety standpoint, I'd say take them to the dry cleaner so they can use the appropriate chemicals on them. It may be expensive, but it's better than possible pulmonary issues if it's not properly resolved.
You could always try something like Dryell, but I'm not sure it would adequately resolve the issue. You could also contact the manufacturer (if you know where you purchased them and who the actual manufacturer is) and see if they have any recommendations.