Even if the clothing items are color, you can safely use a little liquid chlorine bleach.

For a front loader, premix in a container 1 or 2 Tablespoons of bleach with like a quart or so of water. Put the said clothes in the washer and use a delicate or hand wash cycle (so there's more time for the items to soak between tumbles) using warm water temp.

After the washer has filled up with water and tumbled for a few minutes, SLOWLY add your bleach/water mixture into the bleach dispenser so it dispenses into the wash drum. Follow that with a cup of water into the same bleach dispenser to flush it out. This should help kill the mold and release it's staining.

For a old fashioned top loader (that uses a LOT of water), do the same thing but use 1/8 to 1/4 cup of bleach per container of water. Slowly pour the mixture into the bleach dispenser.

I don't know if you can do this on a machine with out a agitator (the type with the wash plate) since the lid locks and you can't access the detergent drawer (since it usually inside the machine).