Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 6 months ago

Bismihi ta'ala

Yes, in ghusl, water must reach all parts of the body, but not that you have to scrub it in. Just by allowing water to flow over it would be enough, with some assistance with your hands to make sure its completely reached the parts. 

Ears are also included, like everywhere else. But, of course not the inside of the ear, or the inside of the nose. Just outer parts of the body. 

And Allah knows best.