Take it to the Veterinarian. To get its hair trimmed.
To keep them clean.
This happens when his bottom gets wet and dirty and it turns into a matted mess. To stop this happening try to keep his cage clean so that there is not wetness where he sleeps. To get rid of matted fur you can try to wash it out but that can hurt the guinea pig, the best way is to just cut the matted fur off.
No! They can clean themselves. But, you can give rabbits a bath if the vet has recommended it.
You can't really "clean" a rabbits teeth. If you see black cavities, bring it to the vet and will give you a specialized medicine.
No. Dogs lick their genital and anal areas (like cats do) to keep them groomed and clean.
Bidets are a means to clean your genitals and anal area after using the restroom.
When I don't clean my flute, tarnish gets on the joints from moisture and it's really hard to get off. If you don't clean it for months it becomes no longer shiny and looks matted rather then finished.
Every 3 days
daily
i clean out my nest when the babies are about 4 weeks of age and no sooner.....
feed your rabbits lots of greens and clean it's cage before it becomes stinky. Clean it water and if it does get snuffles or you think it has it take it to the vet.
Rabbits normally clean themselves, so not really. Although, if they get into anything stinky, i guess it is possible. . . .