Toadfrog, the version we have is slightly different wording. This is from Bluegrass Favorites No. 2, a Joe Morrell book (1980), and is listed as "traditional":

Have you been to Jesus for the cleansing pow'r?
Are you washed in the blood of the Lamb?
Are you fully trusting in His grace this hour?
Are you washed in the blood of the Lamb?

CHORUS:

Are you washed (are you washed)
in the blood (in the blood)
In the soul-cleansing blood of the Lamb?
Are your garments spotless?
Are they white as snow?
Are you washed in the blood of the Lamb?

Are you walking daily by the Saviour's side?
Are you washed in the blood of the Lamb?
Do you rest each moment in the Crucified?
Are you washed in the blood of the Lamb?

CHORUS

When the Bridegroom cometh will your robes be white?
Pure and white in the blood of the Lamb?
Will your soul be ready for the mansion bright?
Are you washed in the blood of the Lamb?

CHORUS

Lay aside the garments that are stained with sin,
And be washed in the blood of the Lamb,
There's a fountain flowing for the soul unclean,
Oh be washed in the blood of the Lamb.

_______________
I don't think the DT discriminates against old hymns~I've found lots of them there. Keep looking; sometimes the name of the tune is different depending on which hymnbook they come out of (seriously).

Lin ^^