Parent are responsible in teaching their kids about cleanliness.
Cleanliness, more importantly starts from keeping our body clean.

Teaching cleanliness should start with personal hygiene. Children should learn the importance of hygiene and the various diseases when they are very young age. It is essential to teach them certain habits like washing hands with soap and water before meals, regular brushing of teeth, using the toilet, taking a bath, and taking wudhu (an ablution).

Cleanliness in Islam emphasis in both its spiritual and physical. On the physical side, Islam requires the Muslim to clean his body, his clothes, his house, his school and the whole community. Allah will reward for being clean.