How do you remove carpet glued to concrete?

A lot of time when you pull the carpet up most of it comes with it. Carpet glues should release and you only need to scrap up the glue residue. If it doesn't then you will need to scrap it all up. There are machines you can rent to do this. They will cost around $80 for 4 hours. Otherwise invest in a good floor scraper for about $30. If you plan to paint or glue anything to the floor in the future, don't use adhesive removers. The concrete is porous and the remover will not just wash away.