You can get fibreglass kits for van floors, I used it myself, stinks to high heaven and your - gloved - hands look like a hairy porcupine when you've finished!!
Way harder wearing than Protectacote and before...er...what is the now acknowledged leader in floor protection?..anyway, it was the standard at one point.
Cost a year or two ago was about £100 or so for a van the size of a vivaro/traffic/primastar.
At one point, Peter Fogwill could supply the kits, don't know if he still does....just checked, yep, he still does, hopefully the link won't be disabled...
Prices from around the £80 mark.
http://www.window-tools.com/window-cleaning.htm
Copy and paste it if it doesn't!
Ian