Umbraco.StripHtml not removing all tags

Hi there,
I have an issue with StripHtml method. I use it fro my search results that need to display a few first characters of the page content. It seems to remove html for some records but not all. If the content is within only p tags it work but if I have strong, heading tags or list items, they are still displayed along with the p tags. Any suggestions how to get it to work and remove all html tags?

Here’s my partial view macro:

 @inherits Umbraco.Web.Macros.PartialViewMacroPage
@using Examine
@{var searchTerm = Request.QueryString["search"];}
@{var searcher = ExamineManager.Instance.SearchProviderCollection["WebsiteSearcher"];}
@{var results = searcher.Search(searchTerm, true).OrderByDescending(x => x.Score).TakeWhile(x => x.Score > 0.1f);}
<div class="row searchHead">
	<div class="col-sm-12">
		<h2>Search results for:</h2>
		<h3 class="searchTerm">@searchTerm</h3>
	</div>
</div>
@{if (results.Count() == 0)
	{
		<div class="row">
			<ul class="searchList col-sm-12">
				<p>Sorry, no results found</p>
			</ul>
		</div>
	}
  	else
	{
		<div class="row">
			<div class="searchList col-sm-12">
				@foreach (var result in results) 
					{
						<div class="searchItem">
							@if(result.Fields.ContainsKey("pageTitle"))
 								{
 									<h3><a href="@umbraco.library.NiceUrl(result.Id)">@result.Fields["pageTitle"]</a></h3>
								}
							else
								{
									<h3><a href="@umbraco.library.NiceUrl(result.Id)">@result.Fields["nodeName"]</a></h3>
								}
							
							@if(result.Fields.ContainsKey("pageContent"))
 								{
									@*var content = result.Fields["pageContent"];*@
									string content = result.Fields["pageContent"];
									if(content.Length >= 350)
										{
											@*<p>@content.Substring(0,350)...</p>*@
											@:<div>@Umbraco.StripHtml(@content.Substring(0,250))</div>
										
										}
									else
										{
											@*<p>@content</p>*@
											@:<div>@Umbraco.StripHtml(@content)</div>
										}
								}
							else
							{
								<p>No Summary</p>
							}
						</div>
					}
			</div>
		</div>
	}
 }

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/71411-umbracostriphtml-not-removing-all-tags