Cosmetics on Pesach...Again

Question

I have read your explanation about cosmetics and other products that are inedible. I would greatly appreciate it if you could clarify for me how these are allowed on Pesach... my confusion stems from being taught many, many times that one should not derive any benefit from any product containing chametz, whether it is edible or not. Since many useful, inedible products contain chametz, understanding this would be a huge help for me. Thank you for your excellent work. Chag Sameach