HIV. Couldn't you drain out your blood and replace it to halt the virus?

Yes, this is exactly what I’m asking. I didn’t expect it to be a cure. Why wouldn’t this idea work to prevent an HIV patient from getting AIDS? The new blood he’d be getting would keep adding new T-Cells into his system. Admittedly the HIV will destroy them eventually but then he just gets new blood with new t-cells.

What’s wrong with this picture?

I don’t know about that, but there is some evidence that it does work the other way around.

Altered HIV Attacks Mice Tumors

Well, for starters, we don’t have enough blood to constantly be giving oil changes to HIV patients.