"What can wash away my sins" is a hymn that speaks about the cleansing power of the blood of Jesus Christ. The lyrics of the hymn are as follows:

What can wash away my sin? Nothing but the blood of Jesus; What can make me whole again? Nothing but the blood of Jesus.

Oh! precious is the flow That makes me white as snow; No other fount I know, Nothing but the blood of Jesus.

For my pardon this I see-- Nothing but the blood of Jesus! For my cleansing this my plea-- Nothing but the blood of Jesus!

Nothing can my sin erase Nothing but the blood of Jesus! Naught of works, tis all of grace-- Nothing but the blood of Jesus!

This is all my hope and peace-- Nothing but the blood of Jesus! This is all my righteousness-- Nothing but the blood of Jesus!

The hymn emphasizes that the blood of Jesus is the only thing that can wash away our sins and make us whole again. It also highlights that our salvation is not based on our works, but on the grace of God.