Everybody does keep chat history on Facebook without touching on it.
Open Messenger on your Android.
We have a tutorial for this.
Here is how you can bulk remove non-friends from Messenger: 1.
They could collaborate to operate more effectively and efficiently.
Update: The plugin seems working for some users and also there is an alternative plugin to do this.
Once you have clear data then those searches from your phone will get deleted and removed.
We are busy on Facebook.