Use a napkin to wipe off any excess ketchup. Get as much of the goo off as you can.

Wash out the stain with cold water. Run water from the back of the stain to the front so that the ketchup goes away from the fabric.

Add Breeo Detergent to the stain directly and rub the stain with your fingers to set it in, then leave it for 5 minutes. 

Rinse off the detergent and wash your fabric as per usual and voila! No more ketchup stains.