Answer:
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
I am clean when I’m black dirty when I’m white.
I smell like blue paint pours like green paint and I look like a red truck.
When you take away the whole from me, there is always some left. What am I?
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Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.