I am clean when I’m black, dirty when I’m white. What am I?

Answer: Chalkboard

More What am I ? with answers

More What am I ?

I am commonly abbreviated to H. What am I?
I am constantly overlooked by everyone but everyone has me. What am I?
I am dark, nobody can see me, I’m very far, nothing can escape me. What am I?
I am easy to get into but hard to get out of. What am I?
I am easy to see, but no one likes looking at me. Without me, there would be no you. I can make you complain, or make you happy. But you almost always take me for granted. What am I?
I am easy to waste and unstoppable What am I?
I am edible, pink, and a great summer food. What am I?
I am enjoyed by some, despised by others. Some take me for granted, some treasure me like a gift. I last forever, unless you break me first. What am I?
I am enjoyed with a pot and some pointy sticks. What am I?
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each. What am I?
I am everyone, yet no-one, I can be anywhere or nowhere, when the lights go out I disappear and when I face myself we multiply. What am I?
I am everywhere but cannot be seen, captured or held, only heard. What am I?