Is my tank ruined?

Hi,

I recently tore down my 46 bowfront FOWLR to move. I farmed the fish out,
and emptied it. There was a lot of coraline algae crusted on the glass.
I wasnt able to scrape much of it off. In a gesture of desparation (and
lack of time to mess with it) I sprayed Tilex bathroom cleaner on it
hoping to dissolve it (it works SO well on my tub).

It didnt work. The algae is still there. So I need to know about future
use of this tank. Which of the following is true:

A) I can use the tank, just rinse it out very well first.

B) I can use the tank, but first I must scrape the coraline crust off,
and rinse/clean it very thoroughly.

C) I have ruined this tank forever, and I might as well throw it away.

My next application for this tank will be a rain forest vivarium with
poison frogs, but it will need to be as clean as for a marine tank.

Also, what can I do to help remove the coraline crust, other than a
scraper and elbow grease?

TIA
Phil