Okay, I didn't know about the laundering cautions, and my thread "bled" onto my garment. What do I do now?
I discovered that a laundry stain removal product called "Shout", which is available in most grocery and discount stores, works great for this. It comes in stick and spray form. I prefer the stick form because it allows me to put it on as heavily as I need to in a specific area. You may need to apply this product and launder more than once.