Additionaly, to easly know if a comment need to be cleaned without open the "Edit metadata screen", I suggest to you to look about Colored column Preference->Look & Fell->Color column.
Here the code I use as exemple:
Code:
program:
color = '#557';
if not($comments) then return '' fi;
if contains($comments, "</div>", '', '1') then return color fi;
if contains($comments, "<p>", '1', '') then return color fi;
if contains($comments, "\s(class|id)=", '1', '') then return color fi;
if contains($comments, "(font-family|background-color|color):", '1', '') then return color fi;
if and(contains($comments, "font-size:", '1', ''), contains($comments, '<h4 style="font-size: medium"', '', '1')) then return color fi;