this looks like a great product, especially with the TSA restrictions on liquids in carryon luggage.

Website says:
The Austin House Waterless Janie Stick Spot Remover is the perfect on-the-go spot remover when you don’t have the convenience of water.

A lightweight powder absorbs oil and grease-based stains and after a few moments is brushed away. Use the Janie Stick anywhere, anytime. Safe for virtually any fabric and will never leave a ring.

The natural, solvent-free, non-toxic and non-flammable travel spot remover packs into it’s own three-inch rectangle so you can place it in a purse or pocket.

This is a great product. It'll handle any grease, butter, oil, etc. spots. I've even used it successfully on spots that have gone through the washer. This 0.4 oz size will last for decades, and the square shape lets you put it right where you want. I give them to my friends as presents.