Rachjordan says:............ You can either dilute in warm water and splash your face. This tends to be more of an everyday solution as its less acidic and won't dry your face out as much. When using directly on my face I get an oval shaped cotton pad (tend to be a little larger) damp in water then squeeze lime juice directly on and apply it to face. This is best done before you go to bed and then use the lime water splash in the morning.
Hope this helps, let me know how you go :)