Starting with version 8 of Clean Text for Mac and version 4 of Clean Text for iOS, Clean Text features are available with other apps (supporting Action Extensions) installed on your Mac your iPhone or your iPad.
How to use Clean Text's Actions in other apps on iOS
When you are in any app (for example Safari or Notes) and you are editing some text, select the text you want to process with Clean Text actions, then tap on the "Share..." item in the pop-up menu that appears when selecting text.
Then choose Clean Text in the activity view.
Then apply the Clean Text actions to your text. When you have done, press the "Copy" button to copy the processed text on the general clipboard of the iOS and paste it on your original document. The new text will replace the selected one.
Related Solutions:
How to use Clean Text's actions on Mac iOS
Related Links:
How to use action and share extensions on iPhone and iPad [imore.com]
How to Customize the Share Menu on macOS [howtogeek.com]