Things that are regarded clean in terms of Religion
* All of the earth (mines, waters, grass, trees, flowers, fruit, etc) the external parts of the bodies of all of the living beings are regarded clean unless something regarded as najasah ghalizah or khafifah smears on them.
Only the pig is an exception. Its flesh, external part of its body, that is, its hair and skin are all dirty. If the clothes or the hand touches it, the part that touches it becomes dirty. It becomes obligatory to wash that part.
Some scholars say it is permissible to use the hair of pig in making paintbrushes and in sewing shoes due to a necessity. That is, the paint applied by a paintbrush made of the hair of pig and the shoes sewn by thread made of the hair of pig are not regarded as dirty.
Shafiis regard the external part of the body of the dog as dirty just like the pig.
* The blood of the flea, lice and bedbug is clean too.
* The fish and other animals that live in water and die in water are clean. Their blood is clean, too. If it smears the clothes, the clothes are regarded clean.
* Small sprinkles of urine as small as a pinpoint or the eye of a needle do not cause najasah on the body or clothes. It is permissible to perform prayers with clothes sprinkled with urine like that.
However, if those sprinkles of urine fall into a small amount of water, that water becomes dirty.
* The smoke from najasah does not make a garment dirty when it touches the garment.
* The mud of the streets is regarded clean whether it is hard or soft whether it contains manure or not. Therefore, the clothes do not become dirty when mud smears on them.
* The water used in wudu or ghusl – they are called ma al-musta’mal (used water) in fiqh – is clean. Dirt can be cleaned with this water. However, wudu or ghusl cannot be made with that used water.
* If someone lies in a dirty bed or on dirty ground, his clothes are not regarded to be dirtied.
* Wet laundry or things laid on a dirty but dry place are not regarded dirty unless traces of dirt are seen on them.