I tried unsuccesfully to clean him up with wet wipes. I was hesitant to expose Mr. Green Garmin to any harsh chemicals so I avoided using any other types of cleaning products.
Finally, I posted my question in the RunningAHEAD.com forums.
MilkTruck replied that he simply washed the band with soap and warm water.
I took Mr. Green Garmin into the bathroom and carefully ran warm water over each band before I applied some handsoap.
I was amazed by how easily the dirt and grime washed off. I used my fingers to scrub away all the marks. I cautiously ran one finger around the hydrophobic bezel.
I couldn't stop admiring how handsome Mr. Green Garmin looked on my run yesterday.
I'm sure he's relieved I've figured out a way to properly groom him prior to his debut abroad at the Athens Classic Marathon.