In general, Eli has mastered eating with utensils. The problem comes in when he gets full, and then gets bored. Stuck in his highchair, the only thing that he has to play with is his food. Not a big deal, unless that food happens to be something other than completely solid. Examples include applesauce, ketchup, and Eli's favorite, yogurt. Since Eli does not stop playing when it is time to get down, I thought I would document the process that I have to use to minimize the post-eating mess.

Here is the "before" picture. Note the upside-down bowl and the yogurt swirls on the tray. This is because Eli thinks that his food can double as finger paint.

First I have to remove any bowls, plates, utensils, and cups from the tray. Unfortunately, this only makes Eli more focused on the paint-like quality of his yogurt.

Next, I wipe the excess yogurt off the tray. This still leaves yogurty hands (as Eli so nicely tells me) that usually mess the tray up again, but this greatly decreases the amount of "free-yogurt" in the area.

Then, I wipe off his hands. I actually have to wipe off one hand and remove the tray and his bib while wiping off the other one. Otherwise, he will rub his hands together and then put the dirty hands on the sides of his chair.

Finally, I wipe off his face (not shown here... have you ever tried to take a picture while wiping a toddler's face? It does not work well), and do a cursory wipe of his hands, legs, clothes, and if necessary, his hair.
The only thing that I have found more successful than this method is to hold him over the sink and hose him down with the nozzle. But then I need to clean up the water mess on the floor...