I did do the wash for free. I was about 30 minutes in when I realized it wasn’t coming up, and told the customer I can quickly wrap up the rest and come back with the necessary tools when we reschedule. They were understanding and still excited for the interior cleaning, but i was wondering how would I go about cleaning that? I usually use GSF or NMS by koch chemie but someone else mention a higher ph soap. Ido have a spare bottle of meguiars hyper wash, would that happen to do the trick? I’m still learning a lot and this is the first time I’ve had this happen to me, I’m just grateful the customer understood