diff --git a/app/helpers/custom_fields_helper.rb b/app/helpers/custom_fields_helper.rb
index 242bfef..fd549f5 100644
--- a/app/helpers/custom_fields_helper.rb
+++ b/app/helpers/custom_fields_helper.rb
@@ -105,13 +105,24 @@ module CustomFieldsHelper
 
     tag_options = {:id => field_id, :class => "#{custom_field.field_format}_cf"}
 
+    unset_tag = ''
+    unless custom_field.is_required?
+      unset_tag = content_tag('label',
+        check_box_tag(field_name, '__none__', (value == '__none__'), :id => nil, :data => {:disables => "##{field_id}"}) + l(:button_clear),
+        :class => 'inline'
+      )
+    end
+
     field_format = Redmine::CustomFieldFormat.find_by_name(custom_field.field_format)
     case field_format.try(:edit_as)
       when "date"
         text_field_tag(field_name, value, tag_options.merge(:size => 10)) +
-        calendar_for(field_id)
+        calendar_for(field_id) +
+        unset_tag
       when "text"
-        text_area_tag(field_name, value, tag_options.merge(:rows => 3))
+        text_area_tag(field_name, value, tag_options.merge(:rows => 3)) +
+        '<br />'.html_safe +
+        unset_tag
       when "bool"
         select_tag(field_name, options_for_select([[l(:label_no_change_option), ''],
                                                    [l(:general_text_yes), '1'],
@@ -123,7 +134,8 @@ module CustomFieldsHelper
         options += custom_field.possible_values_options(projects)
         select_tag(field_name, options_for_select(options, value), tag_options.merge(:multiple => custom_field.multiple?))
       else
-        text_field_tag(field_name, value, tag_options)
+        text_field_tag(field_name, value, tag_options) +
+        unset_tag
     end
   end
 
diff --git a/app/views/issues/bulk_edit.html.erb b/app/views/issues/bulk_edit.html.erb
index 6c532f4..a8c04a9 100644
--- a/app/views/issues/bulk_edit.html.erb
+++ b/app/views/issues/bulk_edit.html.erb
@@ -130,6 +130,7 @@
 <p>
   <label for='issue_parent_issue_id'><%= l(:field_parent_issue) %></label>
   <%= text_field_tag 'issue[parent_issue_id]', '', :size => 10, :value => @issue_params[:parent_issue_id] %>
+  <label class="inline"><%= check_box_tag 'issue[parent_issue_id]', 'none', (@issue_params[:parent_issue_id] == 'none'), :id => nil, :data => {:disables => '#issue_parent_issue_id'} %><%= l(:button_clear) %></label>
 </p>
 <%= javascript_tag "observeAutocompleteField('issue_parent_issue_id', '#{escape_javascript auto_complete_issues_path(:project_id => @project)}')" %>
 <% end %>
@@ -138,6 +139,7 @@
 <p>
   <label for='issue_start_date'><%= l(:field_start_date) %></label>
   <%= text_field_tag 'issue[start_date]', '', :value => @issue_params[:start_date], :size => 10 %><%= calendar_for('issue_start_date') %>
+  <label class="inline"><%= check_box_tag 'issue[start_date]', 'none', (@issue_params[:start_date] == 'none'), :id => nil, :data => {:disables => '#issue_start_date'} %><%= l(:button_clear) %></label>
 </p>
 <% end %>
 
@@ -145,6 +147,7 @@
 <p>
   <label for='issue_due_date'><%= l(:field_due_date) %></label>
   <%= text_field_tag 'issue[due_date]', '', :value => @issue_params[:due_date], :size => 10 %><%= calendar_for('issue_due_date') %>
+  <label class="inline"><%= check_box_tag 'issue[due_date]', 'none', (@issue_params[:due_date] == 'none'), :id => nil, :data => {:disables => '#issue_due_date'} %><%= l(:button_clear) %></label>
 </p>
 <% end %>
 
@@ -178,3 +181,18 @@
 </p>
 
 <% end %>
+
+<%= javascript_tag do %>
+$(window).load(function(){
+  $(document).on('change', 'input[data-disables]', function(){
+    if ($(this).attr('checked')){
+      $($(this).data('disables')).attr('disabled', true).val('');
+    } else {
+      $($(this).data('disables')).attr('disabled', false);
+    }
+  });
+});
+$(document).ready(function(){
+  $('input[data-disables]').trigger('change');
+});
+<% end %>
diff --git a/test/functional/issues_controller_test.rb b/test/functional/issues_controller_test.rb
index ec10af1..34c99a5 100644
--- a/test/functional/issues_controller_test.rb
+++ b/test/functional/issues_controller_test.rb
@@ -3287,6 +3287,12 @@ class IssuesControllerTest < ActionController::TestCase
     end
   end
 
+  def test_bulk_edit_should_propose_to_clear_text_custom_fields
+    @request.session[:user_id] = 2
+    get :bulk_edit, :ids => [1, 3]
+    assert_select 'input[name=?][value=?]', 'issue[custom_field_values][2]', '__none__'
+  end
+
   def test_bulk_edit_should_only_propose_statuses_allowed_for_all_issues
     WorkflowTransition.delete_all
     WorkflowTransition.create!(:role_id => 1, :tracker_id => 1,