Never had a car that was wrapped but the washing products and techniques are the same as far as I am aware. Although I would imagine some wraps may well be softer than baked paint so I would be extra cautious.
I can recommend Bilt Hamber Auto-Foam via a pump sprayer as it cleans much better than snow foam in my opinion. You want to have the car as clean as possible before putting a mitt or pad on it. I also recommend Bilt Hamber Auto-Wash shampoo, best shampoo I've ever used and a little goes a long, long way. However, if you like to see a whole lot of suds and "shaving-foam", these products may not be for you. Personally, I only care how well they actually clean (& how safely)
If the finish is matt, Nanolex do a specific shampoo for matt finishes called Nanolex Matte reactivating shampoo.
Nevertheless, if a company are doing the wrap for you I'm sure they will have their own advice on
how to care for the film they have applied.