Login with your details.
Now go to,https://m.facebook.com/friends/c...It will display all your pending sent requests.Open "Inspect" by Right click on the same page.
Now Go to "console" in top tabs and hit below script.
javascript:var inputs = document.getElementsByClassName('_54k8 _56bs _56bt'); for(var i=0; i inputs[i].click();
}
That's all, all your requests open on that page will be deleted.
(Note: Just ensure to scroll down till all list gets over, this will delete all...
