In the Clear can be loaded in front of the spectator. That said, the gimmick needs to be added to the box before hand. This adding of the gimmick needs to be done in private.
You will end fairly clean in the first place. Cleaner than many mystery prediction type routines. They can check out the cellophane, and card immediately. If you can manage your audience well you may not need to clean up.
If you do want to clean everything up it is more difficult. To give you perspective, if you can palm a playing card and load it in your pocket, you can clean this up.