Remove all the style sheets from a wordpress theme except $styles_to_keep

functions.php

// add the action
add_action('wp_print_styles', 'ac_remove_default_styles');

function ac_remove_default_styles ()
{
    // get all styles data
    global $wp_styles;

    $styles_to_keep = array('admin-menu');

    // loop over all of the registered scripts
    foreach ($wp_styles->registered as $handle => $data)
    {
        // if we want to keep it, skip it
        if ( in_array($handle, $styles_to_keep) ){
            //do nothing
        }else{
            // otherwise remove it
            wp_deregister_style($handle);
            wp_dequeue_style($handle);
        }


    }
}