Making my xbox 360 safe to sell?

Trying to sell my xbox 360.

I want to know how I could make it safe to sell.
I want to remove all my data but the downloaded games I have.

I have minecraft and 6$ in the account,

Is there anyway to safely remove data (passwords, credit card data) without deleting the game and money on the xbox.

If you're going to sell your xbox you should delete everything off it and if you have any credit cards or any other payment methods on it you should remove them even if you're deleting the profile, just to be safe. You can redownload your content at any time through your download history free of charge. So don't worry.