How do you do use carbolic acid as snake repellent?

No.Experiments done with carbolic acid has prooved it wrong.So we are yet to find a strong snake repellent.But for any practical purposes precaution meantime seems to be a better option.House cleanliness,rodent hole destruction,banning snake hiding place (like bushes,unneccessary heapings etc etc) would in great extent reduce snakes gaining access to our houses.