Best way to clean broken down tank?

[bingus]

I’m breaking down my 55 gallon and there’s corraline algae I’ll over the glass. What’s your guys recommendations for cleaning the tank out?

 

[fishface NJ]

vinegar

 

[Tumey]

I just cycled citric acid though a tank that had sat around for probably 2 years with 10 years of built up coralline. After a week I had very little manual removal/scraping left to do. Works great!