WC_get_products Meta Query being ignored

Im having problems with wc_get_products meta query. Im trying to exclude products that have clearance or express in the SKU and the SKUs are formatted like so; (not my choice something the company decided many moons ago!)

My Club - Express - Item My Club - Clearance - Item Another Club - Standard - Item

Below are my args, please could someone tell me what's wrong with them?

    'post_status' => array('publish', 'pending', 'draft', 'future', 'private'),
    'parent' => array( 13, 14, 15 ),
    'limit' => 1000,
    'orderby' => 'id',
    'order'   => 'asc',
    'type' => array( 'simple', 'variable' ),
    'meta_query' => array(
                    'relation' => 'and',
                        array(
                            'relation'  => 'or',
                                array(
                                'key' => '_sku',
                                'value' => 'clearance',
                                'compare' => 'NOT LIKE',
                                ),
                            ),
                        array(
                            'relation' => 'or',
                                array(
                                'key' => '_sku',
                                'value' => 'fxpe',
                                'compare' => 'NOT LIKE',
                                ),
                            ),
                        )
);

I have also completed the woocommerce steps (at bottom of page) Adding Custom Parameter Support which looks like this:

function handle_custom_query_var( $query, $query_vars ) {
    if ( ! empty( $query_vars['_sku'] ) ) {
        $query['meta_query'][] = array(
            'key' => '_sku',
            'value' => esc_attr( $query_vars['_sku'] ),
        );
    }

    return $query;
 }

 add_filter( 'woocommerce_product_data_store_cpt_get_products_query', 'handle_custom_query_var', 10, 2 );

I've also tried reversing the meta query and changing the compare to like or != but nothing works or seems to affect the query.

Any help really appreciate.

Thanks

UPDATE-------------------------------

I made a major typo in the initial post, to confirm I am using wc_get_products no wp_query

I have been trying a few variations of the meta query but so far nothing is working...

Just using a single meta query doesn't seem to work either

'meta_query' => array(
                        'key' => '_sku',
                        'value' => 'express',
                        'compare' => '!=',  // also tried 'NOT LIKE'

                        ),

Becuase of the inital confusion with the query I will mark Howard E's question correct as it is for wp_query and repost witht he correct information.

Try updating your meta_query. You're starting by saying "OR" for the relation of both clearance and express also.

'meta_query' => array(
    'relation' => 'AND',
    array(
        'relation'  => 'OR',
            array(
            'key' => '_sku',
            'value' => 'clearance',
            'compare' => 'NOT LIKE',
            ),
        ),
    array(
        'relation' => 'OR',
            array(
            'key' => '_sku',
            'value' => 'express',
            'compare' => 'NOT LIKE',
            ),
        ),
    )

* To deal with Updated Question *

function handle_custom_query_var( $query, $query_vars ) {
    if ( ! empty( $query_vars['_sku'] ) ) {
        $query['meta_query'][] =  array(
        array(
                'relation'  => 'or',
                    array(
                    'key' => '_sku',
                    'value' => 'fxpe',
                    'compare' => 'NOT LIKE',
                    ),
                ),
            array(
                'relation' => 'or',
                    array(
                    'key' => '_sku',
                    'value' => 'clearance',
                    'compare' => 'NOT LIKE',
                    ),
                ),
            );
    }

    return $query;
 }

Then just use _sku in the product query with a value...

$products = wc_get_products(array(
     'post_status' => array('publish', 'pending', 'draft', 'future', 'private'),
    'parent' => array( 13, 14, 15 ),
    'limit' => 1000,
    'orderby' => 'id',
    'order'   => 'asc',
    'type' => array( 'simple', 'variable' ),
    '_sku' => true,
));

adding this filter will however filter any instance of _sku in the WC query. You may want to add additional conditionals if needed.