This is taken from a fresh install of 4.1.9... perhaps this may help.
Remember to back up the page just in case.
Locate the table (around line 51) with {$lng.lbl_details} inside it and put a comment before it as such...
{* <table width="100%" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><b><font class="ProductDetailsTitle">{$lng.lbl_details}
then locate (around line 203) the second to last </table> tag (just after spotting the Feature_Comparison module inclusion) and add the end comment as such...
</td>
</tr></table> *}
</td>
</tr>
</table>
If you wish to remove the form functionality as well, then below this there is some <inputs> and an ending </form> tag you can comment out. Then go back to the top (around line 11) and there is a beginning <form> tag - comment that out too.
Hope this helps.
Regards,
Doms