remove description in views exposed filter
it can be done either via theme or custom module:

function MODULE_OR_THEME_form_alter(&amp;$form, &amp;$form_state, $form_id)
{
    if($form['#id'] == 'FORM_NAME')
    {
        $form['#info']['filter-FIELD_MACHINE_NAME']['label'] = '';
    }
}


use dpm($form); from the Devel Module to get the complete form name, and field names for non-content type filter criteria:

A suite of modules containing fun for module developers and themers ...


  Devel Helper functions for Drupal developers and inquisitive admins.
  This module can print a summary of all database queries for each page
  request at the bottom of each page. The summary includes how many
  times each query was executed on a page (shouldn't run same query
  multiple times), and how long each query took (short is good - use
  cache for complex queries). Also a dprint_r($array) function is
  provided, which pretty prints arrays. Useful during development.
  Similarly, a ddebug_backtrace() is offerred.


Be aware that removing the label (description) will change the layout of the filter itself, so some css might be required to fix things.