aoepeople/aoe_cachecleaner

Removes old cache entries in your Magento instance

AOE_CacheCleaner

Removes old cache entries in your Magento instance

Magento does not clear old cache entries by itself, therefore the cache will grow and slow down the whole application., _(*1)

The Aoe_CacheCleaner will clean up old cache-entries by firing Mage::app()->getCache()->clean(Zend_Cache::CLEANING_MODE_OLD); in an user-defined interval., _(*2)

Additionally you're able to clean up other caches as well, such as the Catalog Image Cache and the JavaScript/CSS Cache., _(*3)

http://fbrnc.net/blog/2011/02/magento-automatic-cache-cleaner, _(*4)