Macro To Delete Comments And Unhighlight Cells

I am having trouble writing a macro to do the following. Someone had created a spreadsheet a while back that highlighted the cell green and inserted a comment with the person's name and date/time if they changed anything in that cell. The macro works great, but I need a macro to undo the changes.

I would like a macro that will remove all comments from the sheet and revert the cells back to their original color. Since the cells encompass many colors, at the very least, I would like the macro to remove the comments and make the cells the default shading (white).