General Cycling Discussion - Stain in jersey

So I went mtbiking and the chain got stuck on the gears. I dont know how (when fixing it) the chain grease (or however is called) got somehow to my white jersey and I dont know how to remove the stain. Is there any trick or method to remove it? Thx for the help

this is a job for www.haventyoueverheardofGoogle.com. Search for something like "Remove grease stains polyester" or whatever the fabric is and follow the instructions.
Some things you may find:
DON'T put the jersey in a dryer until the stain is gone. You'll set it permanently. It may be permanent anyway, and to me that's OK. A jersey is a piece of athletic clothing--it's going to be worn and get dirty. Doesn't bother me.
Try something like Spray n Wash or Shout, but let it stand longer than the directions say, overnight if necessary (spot test first if you're worried about fade).
Make a paste of laundry detergent and water, work it into the stain with a brush and let stand as above. Keep the paste moist--it quits working when it dries out.
Spray it with a solvent (paint thinner? Simple Green? Whatever you clean parts with), let stand, then launder.
Rub in a dollop of hand cleaner, like GOJO or something from the car parts place. Wait, wash.
I've had good luck with WD40 taking out grease stains. Spray, wait, wash with detergent and the hottest water the fabric will take.
I don't know about those stain removal sticks (Tide makes one, and there are others). Never tried them, My wife says they're good.

Will try.

Try liquid dish soap on the spot. Then scrub the spot with a soft brush (like a toothbrush). Then wash as usual. Usually works for me.

Lestoil. Stinks to high heaven but works great on grease and oil stains - even set in stains. Can be found in the laundry aisle at the grocery.

Smear Goop hand cleaner on the stain. It works really well on grease and oil stains. Let it soak in for at least a few hours before washing. Oxyclean works too, my wife prefers it. It has worked on some small road dirt stains that didn't come out in the wash the first time through. Soak in a solution of Oxyclean and water, again for a few hours.