Has anyone tried cleaning with neem oil or neemb tail?

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I have a friend who swears by cleaning with neem oil. I also heard it is good for fleas etc. I went to an Indian market shop and sourced some but now I'm unsure how to mix it. I heard somewhere it has to be mixed with a detergent such as a shampoo for fleas and nits and mix with dishwashing liquid for cleaning. So I have tried this for now and I'm about to use it. I am just a little worried about the smell of it because I am not fond of it. So I have tried to mix in vanilla essential oil.Does anyone have any suggestions about it? Is it safe to use on carpet? Thanks