Have you ever tried to clean stones, ceramics, etc.? From annoying green, diatom, blue-green and other types of algae with the help of brushes and other devices. Is not a troublesome occupation, and not always the result is an ideally clean result.
So there is a way much simpler and more practical and the cleanliness of the work is guaranteed at 100%. Probably every house has a usual whiteness, but if not, then it can always be bought.
Put stones, ceramic products, etc. (Except for natural snags, etc.) in any capacity, whether it is a bucket or a basin is not so important, pour water and add this very whiteness. After a while, usually no more than half an hour you do not recognize your decorative ornaments, it will be as if you just bought them. Even sandstone, to which any type of algae is attached very tightly, will be cleaned in this way until its original appearance.
Naturally after cleaning all the objects to be cleaned must be thoroughly washed in running water before putting it back into the aquarium.