asi tak ako kazdu inu aplikaciu -> hod photoshop do kosa.
Ak to chces mat uplne ciste tak pouzi nejaky program napr AppZapper, AppTrap, CleanMyMac.
Pripadne to sprav manualne -> http://kb2.adobe.com/cps/331/331404.html
EDIT: nauc sa hlavne pouzivat google! http://sk.lmgtfy.com/?q=AppCleaner