How to update old jeans with the help of working tools and whiteness 

I decided to try to update old jeans with the help of whiteness and working tools.
To be honest, I saw this idea in Tiktok. There was such a cool result, so I couldn't resist and got down to business!
But in my case, the miracle did not happen, the result is terrible.
Now jeans are simply unrecognizable. Therefore, do not repeat it))
Why do you think it didn't work out for me? Write down your assumptions.
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Хобби