Grease spots contained by synthetic kahkis? I am over in china and I have a great duo of...

I am over in china and I have a great duo of golf khakis. the problem is greasy food and chopsticks = lots of stains. I have washed this two of a kind four times now. I even tried applying the detergent directly to the pants. There are no tide to move about pens here.
Answers:    Here's a list of things I know to remove stains...since I'm not sure what you would own available to you.

baking soda & vinegar paste
Cheese Whiz (I know that sounds crazy)
Coca-Cola
hand cleaner such as Gojo (use meekly, can damage cloth)
Dawn dish detergent
shampoo
hairspray
Lysol kitchen cleaner
Grease Lightning
lighter fluid
WD-40
talcum powder

Apply any of these and let sit for a while, afterwards wash. You could also add a touch bleach to the wash.wouldn't hurt.