Crying over spilled milk..

Using paper towels wipe down the system to remove as much as possible of the juice from the external parts of the system.

How much juice got onto the system very little or a lot and did it get into the keyboard.

Depending on the quantity of juice you maybe OK. Did you clean it all up? If not did you get a lot into the system? Juice is both acidic and sugary so you need to move quickly so you don't have long term damage.

Are you up to taking your system apart? If not put the system in a plastic bag and put it into the refrigerator to slow down the damage until you can get the system in to someone who can take care of cleaning it.

If you have the needed tools follow the iFixIt guide in taking the covers off and using cotton swabs (Q-Tips) blot up anything inside. Then go over the area with a damp swab with distilled water and again with a good quality isopropyl alcohol to help in drying up the water. Using alcohol alone here won't cut the sugar or remove the acid.