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// For complete examples and data files, please go to https://github.com/groupdocs-metadata/GroupDocs.Metadata-for-.NET
// initialize PptFormat
PptFormat pptFormat = new PptFormat(Common.MapSourceFilePath(filePath));

// get hidden data
PptInspectionResult hiddenData = pptFormat.InspectDocument();

// get comments
PptComment[] comments = hiddenData.Comments;

if (comments.Length > 0)
{
    // remove all comments
    pptFormat.RemoveHiddenData(new PptInspectionOptions(PptInspectorOptionsEnum.Comments));
    Console.WriteLine("Comments removed.");

    // and commit changes
    pptFormat.Save();
    Console.WriteLine("Changes saved successfully!");
}
else
{
    Console.WriteLine("No comments found!");
}