Can you wash the inside of the lips with soap?

I'm really confused. I know it's said not to put soap inside the vagina or it'll throw off your ph balance. I know it's super important to wash the vulva with soap, and wash the vagina with water. But can you put soap inside the lips? Every time I do, people say don't. But if I don't, people say you should. I'm so confused. I know you're not supposed to use scented products, and that dove is probably the best one to use. But can I please get a proper answer? Everyone gives me different ones and I would like to make sure I'm cleaning properly without causing infections etc. I thought it was okay to use soap inside the lips?
Can you wash the inside of the lips with soap?
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