Fruit juice is sufficiently acidic to be a good electrolyte and could wreck all sorts of otherwise separate circuits. Once dry it is no longer dangerous, but the sugary residue will gum things up like sticking keys.
If the laptop can be made to work again, it would be worthwhile more serious cleaning and washing, but if you don't feel competant then "take it to your dealer"
If all else fails try Dell's warranty or home insurance. Targa (LIDL) has a 3 year warranty I know because I did something similar with coke. They replaced the motherboard free of charge including home pickup and delivery. Good luck
This thread is now locked and can not be replied to.