PrEP is a pill that has 2 anti-HIV medicines taken daily to prevent HIV for HIV-negative people. PrEP is taken before you think you might be exposed to HIV.
It is not recommended to use any products to clean your vagina as it naturally cleans itself. Some products may also predispose your vagina to infections.
Simple warm water and a clean washcloth is enough to use when taking a bath or shower. You may also use mild soap when washing the vulva but be sure not to put anything inside the vagina.
If you are worried about an unfamiliar foul smell or discharge please see your doctor as this may need treatment.