Afternoon Tom,
If you can afford it then i would say yes have it done on the van.
I recently purchased a new van from the Caravan National Rally and as part of the deal i recv'd supagard treatment on the inside and on the outside of the van.
After every wash it looks like it has just been polished. They provide you with your own bag of cleaning goodies to use. Say goodbye to black streaks with just a gentle wash.
Here is the details of my regional contact at Supagard.
Gary Askam
Business Development Manager - Midwest Division
Mobile: 07825633011
Office: 01509 678934
E-mail: g.askam@midwest-web.com
Website: http://www.midwest-web.com
Thanks
Rob.