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I had to use a razor blade to clean the mineral deposits on the glass that covers my light. It took awhile, but I still see a small film in some spots. Is there a cleaner that works better and that would save time?

This is for a freshwater tank.

Hi,
These mineral deposits are essentially carbonates that
remain after the water has evaporated.
I purchased a plastic "scrubby" from the grocery store,
and a gallon jug of white vinegar. The vinegar is a weak
acid, and will dissolve the deposits. For particularly
stubborn ones (after a couple of weeks of neglect), I
pour some vinegar directly on the glass, over the kitchen
sink, and scrub with the plastic scrubby. Rinse with
warm water, I next wipe the glass dry with paper
towel and the glass is crystal clear afterward.

Frank


-->>> The Confidence of Amateurs, is the Envy of Professionals <<<--

Although I do not speak from adequate experience I do believe that there is a product available known as "Lime-Away" that claims to remove mineral deposits from aquarium fixtures.

I use a razor blade with warm water and vinegar and it works great.

CLR is great for removing calcium, Lime and Rust, for the glass cover it would just need some extra rinsing. Although vinegar works great as well and is non-toxic, and baking soda adds a bit of scrubbyness to it as well. That's what I use in our coffee pot. Baking soda and ice and swirl it around, soon all calcium deposits are gone.

"If you're afraid you'll make a mistake, you won't make anything."
-Family Circus

thanks to all for the quick respones, I have some vinegar so I'll try that.