Albert Barnes Commentary 1 Kings 22:38

"And they washed the chariot by the pool of Samaria; and the dogs licked up his blood (now the harlots washed themselves [there]); according unto the word of Jehovah which he spake." — 1 Kings 22:38 (ASV)

They washed his armour - Rather, “the harlots bathed in it.” The “pool of Samaria,” which was stained with Ahab’s blood by the washing of his chariot in it, was, according to Josephus, the usual bathing place of the Samaritan harlots. A large tank or reservoir, probably identical with this pool, still remains on the slope of the hill of Samaria, immediately outside the walls.