a messy baby is sticking his hand under a running faucet.
The baby is trying to get his hands clean.
The  messy baby may be simply be playing by sticking his hand under a running faucet and is not necessarily trying to get his hands clean.
exists e1 e2 s1 x1 x2 x3.(under(e1,x3) & n_faucet(x3) & Actor(e2,x3) & v_run(e2) & Theme(e1,x2) & Actor(e1,x1) & v_stick(e1) & n_hand(x2) & of(x2,x1) & n_male(x1) & n_baby(x1) & a_messy(s1) & Theme(s1,x1))
exists e1 p1 x1 x2.(n_hand(x2) & of(x2,x1) & n_male(x1) & n_baby(x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 p2.(exists s1.(Theme(s1,x2) & a_clean(s1)) & Recipient(e2,p2) & Actor(e2,x1) & Topic(e2,x2) & v_get(e2)))