Plastic pipes I live in a mobile home.
Do not put straight sulfuric acid in your drain. Acid poured into water produces heat and releases hydrogen - which can go boom. Muriatic acid (dilute sulfuric) is more commonly used. Remember, if you pour it in and it doesn’t drain, you (or a plumber) will have to work in that environment.
A drain cleaner used around here is ”Thrift.” Works good on grease, hair, etc. I think it’s sodium hydroxide, so don’t pour acid on it.