I've got a virus or adware , looks like a Chinese thing, - how do I get rid of it if I'm not rooted?

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Android Central Question

I got this budget Android phone from Amazon, Juning.
Its been working well but I found out that the Launcher it comes with is [allegedly!] sending data back to China.
Anyway, I replaced it with google launcher and its been working well.

Now I have a kind of a virus which I think is Chinese or foreign since the English is broken.
It puts a facbook icon on my home screen and says, "reward is here for you". And I get a full screen advert too.
I've not installed anything new for months and its just started happening last week.
I de-installed as much as I can but its still there.
I ran an anti-virus and it didn't find much.

help!