New Delhi, November 17 A 6-year-old boy in Shanghai has come up with a formula to avoid getting bashed up by his parents.

The youngster was said to have spent 2 hours in the restroom, devising the chemical to take revenge and claims the mixture can give wrinkles, reports the China Daily.

The boy threatened to spray the "medicament", apparently made of shampoo, bath foam, soap and vinegar, on his parents the next time he is beaten.

Psychologists have urged the parents to approach the child with more care and understanding methods. (ANI)