Better yet... keep the chain clean and no problems!

Shimano makes a really good product for removing grease and dirt. You can buy it in small portable packets that you can keep in a seat bag or Camelbak. Works well. Also any hand cleaner made for industrial automotive shops works well. I keep some out on my work beach. Also alittle scouring power (like Comet) works really well. Just be gentle - do not scrub all that hard. And Dawn works well.