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.

Derrick Hammer

This plugin will re-route all transient activity to a dedicated table each for both single and multisite. You can not use this with object cache! This plugin is mainly useful if you can not make use of object cache for any reason to help your site performance.
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Dedicated Transients

WordPress plugin to re-route transient storage to dedicated tables.

Clear Transient From Dashboard vs Dedicated Transients