Lines 225-226:
O filthy head of ill-starred hair, how savage you have become by being so long unwashed!Line 387:
ὦ βοστρύχων πινῶδες ἄθλίων κάρα,
ὡς ἠγρίωσαι διὰ μακρᾶς ἀλουσίας.
Poor man, how wild you look with your filthy hair!Euripides was famous or infamous for his realism (e.g. the notorious rags of Telephus), and I imagine that the actor playing Orestes wore an unkempt wig.
ὡς ἠγρίωσαι πλόκαμον αὐχμηρόν, τάλας.