Custom vinyl lettering for back shell window

I need some advice on getting vinyl lettering on the back window of my shell. I want to put my website in white letters across the tinted back window. I see dozens of Tacos daily in traffic and want get their attention. I see several online places where you can type in what you want and they will send the lettering for $20-$30. Is there anything specific to look for in materials or adhesive? Things get pretty dirty on the back window especially in the winter. The other option is to have a local place do it. Does anyone have a good place on the south side of Denver?

 

Should be a guy at a kiosk in the mall that can do it.
Take him the artwork if it has an image, or just the text and font if no artwork.

 

NVM... just checked the web site.

Ya, just have him print it in Times New Roman in whatever size you want. The mall guys can typically do up to 8" wide, which would be a couple of feet long.