I use a mix of HOT water, dawn, and, as weird as it is, a little bit of laundry detergent LOL. I typically have to scrub though, so, probably not the best for wallpaper.
All in all, I need 990k for medallions and 1mil for a sven, it will be interesting to see if I can make enough. I also need enough money to recreate all these embryos XD