Mold can be a very dangerous thing, so be very sure about the color of it. I cant over state that enough....ANY color and it needs to be tossed.
I had a few tubs of substrate get contaminated with brown mold once...well me being young and stupid I cleaned it all up with no respiratory protection. Spores EVERYWHERE....in the air, on my hands, on my clothes. It nearly put me in the hospital. I had migraines for days, couldn't stop shivering no matter what the heat in the house was set on. Couldn't eat, hell I couldn't even get up out of bed for 2 days. It was the worst experience I have ever had and I rarely get sick and this completely shut me down in a matter of hours. So just be careful with mold.