Cages should be cleaned at least once weekly and more often if multiple animals are kept in the same cage. If you start to smell ammonia, it's past time to clean the cage. The ammonia on the animal's level is much higher than you smell. Dump the old bedding, wipe the bottom of the cage with a mild soapy water, wipe dry and replace bedding, food and water. Do keep animals dry.
Many species like to play with the water and water bottles.
Bedding should be changed whenever it is wet. Do provide adequate space and an enriched environment for the animals. Do keep your animals in a warm environment. Don't place them in direct sunlight or in drafty areas. Do provide adequate water for the animals.