How to clean storage space of iPhone

the only way to fully clean the storage is to reset the phone to factory settings

How to factory reset your iPhone, iPad, or iPod touch - Apple Support

but if you mean to free up storage then try

Clear the Clutter: How to Free Up Space on Your iPhone or iPad | PCMag

more

iphone free up storage - Google-

Mollytzeke wrote:

I need steps to clean storage on my iPhone

Exactly what are you hoping to accomplish?