Macscale
Aquarium Advice Addict
I believe it's chemiclean, but you know that it will just come back unless you fix the cause which is most likely excess nutrients in your system. IMHO you'd be better off manually removing as much as you can during your wc's and increasing your wc's (both frequency and volume) until you get rid of the algae.
+1. That's the best way do it...