I've recently switched from Autoglym stuff to Megs NXT Tech Wax topped with Harly Wax with fantastic results. I plan to do a proper wash at least every other week. I'm not sure what to do about the wax though. It seems logical to top up with Harly wax regularly rather than use NXT which would remove the Harly with its cleansers. Would doing that say once a month be enough to protect the paintwork?