How to remove malware from WordPress website?

Malware infected WordPress websites are being a pain for WordPress website owners. Simply you will bite your nails when you see your website is hacked and is infected with malware that loads on your website in iframe tags or JavaScript tags.

All you think at that time is:

• How did my website got hacked?
• Why only link to my website on Google result pages redirect to some other website?
• What are those unknown iframe / JavaScript codes in my website’s source code?
• How to remove malware / virus from my WordPress website?