I found out I have some concrete mix in the basement floor drains, and the basement floor drains clogged twice in the past year. How do I remove these concrete mix from the drains?

I found out I have some concrete mix in the basement floor drains, and the basement floor drains clogged twice in the past year. How do I remove these concrete mix from the drains?

Using a chisel might damage or punch a hole through the floor drain.
Acid is dangerous to your health. Try this; http://72.14.209.104/search?q=cache:W7xatHq9n0QJ:www.noco.com/Specialty/Tough%2520Stuff%2520(1113)NOCO%25202.05.pdf+dissol ve+Cement&hl=en&gl=us&ct=clnk&cd=4
Good luck, Tom