I love shopping second-hand with Mimi-n-Moe's Mom. We were at a rummage sale when she commented on how beautifully stain-free a seller's kids' clothes were. This scored us the best find of the day.
The mom uses Dawn dish washing foam to remove stains. If she cannot hand scrub the stain out with Dawn alone she adds a little baking soda "and that takes out most anything."
While I still often use Dial bar soap for a stain-remover, this is one hot tip. Dawn works quickly, and stains take less time to remove. If using a front loader or other high efficiency washer, wash the Dawn out thoroughly before laundering.
I've tried Dawn and baking soda against some stains that went through the dryer and while it lightened the stains considerably it did not fully remove them. I've placed the articles in direct sunlight to see if the remaining stains fade out, but we haven't had many sunny days lately.
***Baby Toolkit is not affiliated with Dawn nor its parent companies. We aren't laundry professionals though we're well on our way to the 10,000 hours required for mastery. Not to brag, but we seem to be naturally gifted in the field of entropy.