You can use this .htaccess rule for removing multiple trailing slashes anywhere in URL:
Example:
http://yourdomain.com/page/1//// will be redirected to http://yourdomain.com/page/1/
Add the following code to your /public_html/.htaccess
RewriteEngine On
RewriteBase /
Options +FollowSymlinks
RewriteCond %{REQUEST_URI} //+
RewriteRule ^(.*) $1 [R=301,L]