The iPad & iPad mini likely both use Safari…..possibly the iphones as well. This site will give you instructions with screen shots to help clear your cookies.
Depending on what browser you are using, for IE:\
Tools –> Internet Options –> General –> go down to browsing history, hit the Delete button to delete all of your history, to include cookies.
Tools –> Options –> Privacy –> Go to History, change it to Never remember history, hit the Ok button