How to clean the data in HHD by software?

[lqw24]

I have a old PC with HDD.I want to sell the PC.Now ,I want to clean the data in HDD by software.It shouldn't be recovered by normal methods.That's ok for me.
Can you tell me how to clean the data ?Which software?
Thank you for saving me.

 

[johnb35]

This article lists 5 programs so take your pick.

https://helpdeskgeek.com/free-tools-review/5-free-programs-to-completely-wipe-a-hard-drive/