Which action can clean symbols in the feed? (EM)

This article will help you in case some of the content in your feed contains symbols such as %&<>;

In the specific column containing the symbols, open the Actions from the drill-down menu: 

Select an action of Edit HTML > Strip HTML: 

In case your feed contains JavaScript symbols, use first the action of Unescape HTML: 

Now you can add another action of Strip HTML > Save: