...my inner legs are covered in balck grease from the cogs. I wipe the chain down with a rag after each ride but still in builds up...I lube it with some teflons type lube from Halfords for bikes...but it still goes blackand yucky. ...normals I know...but How should I clean this gunge off the cogs? Also does anybody have any tips for washing shirts thant have got grease on them?... Ta.