I have used rubbing alcohol for almost 35 years for cleaning tanks. Apply
with a cloth then rinse well. ALSO....non iodized salt works good
also....lightly dampened....Thanks
"Desmond Wong" wrote in message
...
Hi,

Any ideas on the best way to clean a second hand tank? I have aquired one,
and found that because the previous owner kept it only half full, the
bottom
half of the tank is quite clean, but the top half has this white film-like
substance on it.

I have tried using water and a razor blade, doesn't seem to lift. What
would
be safe to use on it to rid this stuff?

Des.