Spot on, I did the same thing with my 55, razors didn't work, but vinegar helped loosen a little of them, then I CLRed the whole tank... But if you CLR the tank, you HAVE to rinse VERY well, as it's a SUPER strong chemical. :thumb:JoelRHale said:Dirty as in hard water stains or like general muck? Warm water rinsing and scrubbing is always a good place to start.
Then in order from no chemicals to using them would probably be: using a razor blade to scrape the glass (just did that today for a possible 10g nano tank, thanks ktaylor if you're reading this!), white vinegar in rags left on the glass, muriatic acid, and then a final last ditch effort would be CLR.