Who - The character you just created.
Joe
Where - Where does the action take place?
San Fransisco,California
When - When does the action take place?
At night
What - What is the problem the character is facing?
To clean San Fransisco,California 

Why - Why is this issue important to your character?
It might kill him too.
How - How is your character going to overcome this problem?
Cleaning it.