Very Clean...

This morning we got an emergency request to deliver B's summer white uniform to him at work.  If you aren't acquainted with this uniform, it is very white, very pretty, and very hard to keep clean.

(This is B and his little brother O.)
Here is the conversation when we got in the car to drop girls off at school and then go deliver the uniform to the hospital where daddy works.

Miss M (6):  I get to be by Daddy's suit!
Miss A (8):  Don't touch it!  It's sterile.
Miss M:  What does 'sterile' mean?
Miss A:  It means really really really clean.  For example, Heavenly Father is sterile.