We have a water based degreaser at my shop that works incredibly well for this, doesn't hurt the plastic. Called Dash Degrease but it is from a local supplier so that likely won't help you much.
The good news is that once you are through break-in you will have to clean your sled about one tenth as often.
The good news is that once you are through break-in you will have to clean your sled about one tenth as often.