You can. You don't necessarily need to, but you can use some baby shampoo with nice warm water, ensuring that you dry them completely when they're done to ensure they don't get too cold.

Some Guinea pigs have some teeth issues that require veterinary attention, but otherwise, ensuring they have unlimited access to hay will help grind down their teeth naturally.

We see Guinea pigs here. But otherwise, you can look online. If you search for a guinea pig veterinarian, you should find someone that feels comfortable seeing guinea pigs. They'll advertise it on their website.

We've got a lot of good husbandry information that we provide to a lot of our clients when we see them, but they'll need an enclosure with proper bedding, proper food, like hay and pellets, and proper cleaning just to make sure that everything goes well.

They're relatively easy to take care of. I would say that they're easier than a dog or a cat, but they're still a little bit of work.