How to clean them ?

Hello , I’ve have my ecosphere since COVID and over the years so much algae has grown one the sides to the point I can’t see into it. I know it’s still thriving when I’m look though the bottom.does any one have suggestions to help

Hello , I’ve have my ecosphere since COVID and over the years so much algae has grown one the sides to the point I can’t see into it. I know it’s still thriving when I’m look though the bottom.does any one have suggestions to help