I think if you have bought a system from them you can use their logo over and over again but only if you purchased the sytsem,There are pleny of logos out there on vans that I've seen and are much better than Ionics,get a mate to take a photo of you from the window you are working on using your pole,bring it to the printer for editional purposes,with the brush and water effect on a window will show exactly what you do,at least it shows more than Ionics show, Ionics one is like the BT logo,it does'nt state what the service is
If I was a normal customer and seen an Ionics Reach And Wash logo on the side of a van I would'nt be any wiser in thinking what they wash,they could be Dry Cleaners for all I would think.
The logo does'nt describe what exactly you do,unless of course you had WINDOW CLEANING under it,but face it the logo is just a trade mark and does'nt sell the service.