A user has to perform any of the following to have unsubscribed under the following condition:

By deleting the Cookie data manually from his browser settings:
Deleting cookie data manually can differ from one browser to another. One need to delete cookies manually from respective browser settings.

Read: Manual deletion of cookies in chrome, and Mozilla Firefox

In an event of cookie deletion, the user gets automatically unsubscribed and thus may have to visit the website again to re-subscribe to receive push notifications.

Using an application that scans, and deletes cookie and cache data for system maintenance:
There are a bunch of software options which aid cookie deletion. This software helps the PC to rejuvenate by deleting unwanted files, browser history, and browser cookies. Thereby, unsubscribing the user to receive push notifications from various websites.

Read: 6 best cookie cleaner software in the market.

Also, read:
How do push notifications work on mobile browsers?
what browsers support Truepush notifications?

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Website: www.truepush.com
Email: help@truepush.com  

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