Bleach and hydrogen peroxide are two of the stronger contender ... It's a powerful oxidizer because pure chlorine is a toxic corrosive gas. When used as a cleaning product, it uses this toxicity ...
So while you probably can't render an old, badly yellowed towel pure white once more without traditional bleach -- if you go in with realistic expectations, hydrogen peroxide can be an effective ...
Gently file down the nail extensions layer by layer until completely removed. Mix hydrogen peroxide with warm water, soak ...