Here's how I do it:

Singing in the Bathtub      Cleary, Magidson & Washington 1929

(C) (B) (Bb) (B)

(C) Singing in the bathtub (Ab7) Happy once again
(C) Watching all my troubles
(G7) Go swinging down the (C) drain (B) (Bb) (B)

(C) Singing through the soap suds (Ab7) Life is full of hope
(C) You can sing with feeling
(G7) While feeling for the (C) soap. (C7)

Oh a (F) ring around the bathtub (C) Isn't so nice to see
(C#) But a (D) ring around the bathtub
Is a (G7) rain(G#7)bow to (G7) me

(C) Reaching for a towel (Ab7) Ready for a rub
(C) Everyone is happy
(G7) While singing in the (C) tub (B) (Bb) (B)

(C) Singing in the bathtub (Ab7) Sitting all alone
(C) Tearing out a tonsil
(G7) Just like a bari(C)tone (B) (Bb) (B)

(C) Never take a shower (Ab7) It's an awful pain
(C) Singing in the shower
(G7) Is like singing in the (C) rain. (C7)

Oh, there is (F) dirt to be abolished but (C) do not forget one thing
While (C#)your (D) body's washed and polished
(G7) Sing (G#7) brother (G7) sing!

(C) You can yodel opera (Ab7) Even while you scrub
(C) Everyone is happy
(G7) While singing in the (C) tub. (B) (Bb) (B)

(C) I'm forever (G7) blowing (C) bubbles
(A7) Pretty (D) bubbles (G7) in the (C) air. (B) (Bb) (B) (C)