ReptiShine is the best glass cleaner you have ever used; fly poop - snails slime - fingerprints will be removed in the blink of an eye!
 
Spray and Wipe principal: it was designed to leave no residue so it is perfectly safe to clean the inside glass of your terras as well! Be sure to remove the animals before spraying inside the terrarium, it has a 60% alcohol vapour.
 
Animal safe - no residue
Leaves no stripes
60% alcohol
100% biodegradable