What is the best way to get rid of a hard stain on polyester material?

Question

I got some grease type stains on a polyester jacket, and I tried to get it off with my laundry machine, but it didn't full get the stains out.

Any ways to get rid of them permanently? Thanks

Answer 1

rub some (blue) dawn dish liquid on the grease on both sides  before wash.  If you have washed it already

brush the dawn in a tooth brush. The dawn will break through the grease