Plastic Polish

Question
2 Gallon acrylic tank, with one Betta. I experimented with live plants and decided to to back to plastic. Unable to get the gravel clean, I drained all the water and rinsed out the gravel well. I put a little unrinsed gravel in a mesh bag and I reused the filter cartridge. While I had the tank empty, I cleaned off all the stubborn alge spots with the rough side of  sponge. I refilled the tank, now I have horrible scuff marks all over.
If I empty the the tank again, can I use Novus 2 Plastic Polish? Is it toxic? I would need to use it, rinse the tank, and immediatly put the Betta back in.
How would you proceed?  

Answer
Hello,

You should never use anything to clean your aquarium except water. I am sorry that your tank got scuffed up, but it may be irreversible now. The best way to get algae spots off the tank is to clean them off with a gentle sponge and much patience. There are some scrubbing pads that are thinner and that don't scratch glass, and they are much better to use then rough dish sponges.

I hope this helps.

Regards,
Stephanie