If the leaves are dusty, then a good cleaning with a damp cloth is important especially for the huge indoor trees.
Probably the most popular indoor trees now are in the ficus clan.
Once confidence builds up on maintaining these indoor trees, there is no limit to the possibilities.
What most often does in an indoor tree is soggy soil.
Water indoor trees no more often than once a week.
Allow these indoor trees to grow at their own pace and feed them once or twice during the winter season.
Too often indoor trees are allowed to grow untrammeled and soon look messy.
The same is true, of course, when decorating the indoor tree.
Again, this may sound rather like deprivation, but indoor trees do not need much in the way of nutrients.
But since these indoor trees are a major investment, be careful about matching the growing conditions available at home to the plant's needs.