Can I use hot water to remove grease?
Warm water is best — hot water can set the stain before it’s lifted.
Does baking soda really work on old grease?
Yes — it absorbs oil that’s already embedded in the fabric.
Will vinegar discolor cotton?
No, white vinegar is safe for all cotton types, including Supima.
Can I dry the shirt in sunlight?
Yes, after the stain is gone. Sunlight naturally deodorizes cotton.