I just assumed that anything used for cleaning a car would be safe to the paintwork/wax etc...
I'm going to assume that picture in the red diamond means that it's definitely not PH neutral
But you're right mate it's a bit of a waste to pay so much attention to detail cleaning/waxing and then speed up the deterioration process by using something non-ph neutral, it's just something I'd not even considered.
I'm not gonna lie though I'm gonna use the rest of the demon foam (think you only get 6/7 washed out of it anyway) and then switch to that citrus stuff. I'll just have to make sure I check and top up the wax if necessary before I switch!