minkapi

Logging in as admin, you can clear all transients from the dashboard. 
If you can find no change in your screen, it is convenient to immediately check whether it is due to a transient or a bug.

Clear Transient From Dashboard

An excellent plugin to clear out transients. Rather useful for debugging issues on your site.

Work as Stated

Logging in as admin, you can clear all transients from the dashboard.

Surbma

CherryPick Studios

This plugin is a Multisite plugin. It can be activated only in network wide. The Surbma | Multisite Transient Cleaner plugin deletes ALL transients from ALL sites in a Multisite. So please be careful and don’t forget to backup your database before acivating this plugin!
The transient deletion only runs once, when the plugin is activated. You can leave it as is, but I strongly recommend to deactivate it and activate again, if you need so.
I don’t recommend this plugin for anybody and I don’t promise anything, this plugin can solve, it is doing, what it says: deletes ALL transients from ALL sites in a Multisite. If you need a simple way to do just this, this plugin will do the job.

Surbma | Multisite Transient Cleaner

Deletes ALL transients from ALL sites in a Multisite.

Clear Transient From Dashboard vs Surbma | Multisite Transient Cleaner