How to reset the state of a Redux store?

I am using Redux for state management.
How do I reset the store to its initial state?

For example, let’s say I have two user accounts (u1 and u2).
Imagine the following sequence of events:

1. User u1 logs into the app and does something, so we cache some data in the store.

2. User u1 logs out.

3. User u2 logs into the app without refreshing the browser.

At this point, the cached data will be associated with u1, and I would like to clean it up.

How can I reset the Redux store to its initial state when the first user logs out?