Riddle

What cleans but never ever gets dirty?

Choose an answer

A.A vacuum cleaner
B.A mop
C.A sponge
D.A bar of soap.
Hint: It's a 4-word phrase with 10 letters, starting with "A".

Answer

A bar of soap.

Why this is the answer

Soap dissolves and rinses away dirt with the water used to wash, so it never accumulates visible dirt itself the way other cleaning tools do.

This riddle is filed under Dirty, Family Riddles and rated Medium.