(a)
ask. düşmanı temizlemek, silip süpürmek.
The battle was won, except for mopping up a few small groups of enemy soldiers who continued to fight. (b)
k.d. bitirmek, tamamlamak.
I must just mop up the last of the work. (c) silmek, temizlemek.
It was you who dropped the milk, you'll have to mop it up.