clean_shortcode

<?php

// clean up shortcode

function parse_shortcode_content( $content ) {

   /* Parse nested shortcodes and add formatting. */
    $content = trim( do_shortcode( shortcode_unautop( $content ) ) );

    /* Remove '' from the start of the string. */
    if ( substr( $content, 0, 4 ) == '' )
        $content = substr( $content, 4 );

    /* Remove '' from the end of the string. */
    if ( substr( $content, -3, 3 ) == '' )
        $content = substr( $content, 0, -3 );

    /* Remove any instances of ''. */
    $content = str_replace( array( '<p></p>' ), '', $content );
    $content = str_replace( array( '<p>  </p>' ), '', $content );

    return $content;
}

// move wpautop filter to AFTER shortcode is processed

remove_filter( 'the_content', 'wpautop' );
add_filter( 'the_content', 'wpautop' , 99);
add_filter( 'the_content', 'shortcode_unautop',100 );


// example of cleaning of the shortcode

function test_shortcode($atts, $content) {
	extract(shortcode_atts(array(
		'id' => '284882215' // default
	), $atts));

 	$content =  parse_shortcode_content($content);
        return $content;
}

add_shortcode('test','test_shortcode');

?>