What do you haveto do to access the tank? It looks as though there is a cabinet above the aquarium door in the second pic. Hopefully whoever installed the sucker thought about that. (I tried to help a customer set up a a tan once where he had someone put a cutout in his wall that was only about 3" taller than the tank and no access panel. As I recall, he was VERY disappointed when he figured out he had no room to put in fish, much less vacuum the gravel or scrape algae.)
What equipment do you have? I see the power filter in the second pic, and it looks as though there might be some stuff in the tank. Can you get some pics of individual components to share? Take an inventory to see what you have, and then we'll go from there.
I would start by pulling the tank out and rinsing. If you have hard water stains or scale, you can use vinegar and elbow grease to dissolve it.
I'm sure many folks on this board (myself included) will be happy to help you out any way we can.
It is a violation of federal law to use this product in a manner inconsistent with its labelling.