Dude - retire the tie. There's no hope.

you can try Tide to Go Instant Stain Remover

http://www.tide.com/en-US/product/tid...

Tide Solution for Mustard Stains
1) Brush the excess stain off the surface of the fabric.
2) Rinse in cold water to dilute the stain.
3) Pretreat stain with Tide® Liquid. Pour Tide on to cover stain and let set for 20 minutes.
4) Wash in warm water with 1 use of Tide. Try Tide® Bleach Alternative.

I recommend scissors or just wait until Fathers Day.