I do a section at a time and just move the racks. It's not pretty.... Also, I loathe the curved glass of the Fluval Flex and it is my main regret. I kind of hate it and don't spend a ton of time worrying about it being spotless. In all honesty though, it stays pretty clear for me.How do you clean your front glass with Frag racks all over it? I would go crazy if I couldn’t clean the front glass.