Straight from the Tenecor handbook, this may or may not help...I'm sure you already know, but no ammonia or alcohol.
Cleaning Aquariums With Bleach
On occasions where a complete cleaning of the aquarium is required, such as a change from saltwater to freshwater or after prolonged storage, the use of chlorine bleach can be very effective. A half gallon of bleach mixed with 20 gallons of water or more is great for sterilization and is perfectly safe for acrylic.
Removing Calcareous Algae and Diatoms
Some aquarium growths, such as calcareous algae and diatoms, are very hard and can be difficult to remove with standard cleaning pads. Simply use a plastic card such as a credit card, drivers license, or plastic putty knife to scrape growths from the acrylic. Using the edge will transfer more pressure to the growth, reducing the work, and because the card is still relatively soft it won't damage the acrylic. Several scrapers designed specifically for use with acrylic aquariums are now commercially available.
