And I just found it in G, a little different:

Singing in the Bathtub      Herb Magidson

(G) Singing in the bathtub
(Eb7) Happy once again
(G) Watching all my troubles
Go (D7) swinging down the (G) drain (F#) (F) (F#)

(G) Singing through the soap suds
(Eb7) Life is full of hope
(G) You can sing with feeling
While (D7) feeling for the (G) soap. (G7)

Oh a (C) ring around the bathtub
(G) Isn't so nice to see
(G#) But a (A) ring around the bathtub
Is a (D7) rain(C#7)bow to (D7) me

(G) Reaching for a towel
(Eb) Ready for a rub
(G) Everyone is happy
While (D7) singing in the (G) tub (F#) (F) (F#)

(G) Singing in the bathtub
(Eb7) Sitting all alone
(G) Tearing out a tonsil
Just (D7) like a bari(G)tone (F#) (F) (F#)

(G) Never take a shower
(Eb7) It's an awful pain
(G) Singing in the shower
Is like (D7) singing in the (G) rain. (G7)

Oh, there is (C) dirt to be abolished
But (G) do not forget one thing
While (G#)your (A) body's washed and polished
(D7) Sing (C#7) brother (D7) sing!

(G) You can yodel opera
(Eb7) Even while you scrub
(G) Everyone is happy
While (D7) singing in the (G) tub.

I'm forever (D7) blowing (G) bubbles
(E7) Pretty (A) bubbles (D7) in the (G) air. (F#) (F) (F#) (G)