Sorry to get your hopes up kids, but this isn't a hot shower video, it's just an adorable one featuring a simply precious furless little rat getting a good scrub on.
This rat was bred to be hairless, so it's purely genetic. I think it also has rex genes in it which make the whiskers very short. I used to have a rex hairless rat. He was a little sweetheart. They are very very nice pets. Some rats are afraid of water and hate taking baths, so this little guy's owner is very lucky.