What to clean the aquarium:
broom ! (You should probably provide one just for this so you don't dust your regular broom. A first prize would be just fine!)
dishwashing liquid
Optional: a little hot white vinegar for the dirtiest of bathtubs (as in the miracle shower cleaner, which you've had very positive reactions to)
Tub cleaning steps:
1) Line the tub with washing up liquid. Cover it with a little white vinegar if you wish