Nice to see that Scott, maybe we will run into each other one of these days!
That's funny you mention the optima steam cleaner showmob. I was on the phone with a couple steam cleaner companies to find a steam cleaner that can run consistently without losing pressure. They mentioned that one but said customer service and the product itself doesn't last too long.
I checked out there website. Looks like a killer machine and it has 1 year warranty. It is on the pricey side but could be well worth it, just as long as it holds up.
As far as taking off the wax, I feel as long as you don't hold the gun too close it should be fine. They say to use just steam, but I would most likely use Meguiars rinse free as well!