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Works searching result of "cleaning"

How to make same surface ?

Hello, I am currently practicing shooting products and cleaning them in photoshop, I am experiencing a problem. 
The sponge that I shooted down below is not unicolored, notice the dark and light parts of it. 
How can I make all the surface get the same color using photoshop? 
I searched online a lot but couldn't find my problem. 

I also have other photos with same issues. 
Thanks!