What is the first aid treatment if kids accidentally drink PRIL utensil cleaning liquid?

Many cleaning products are caustic and so do damage to the tissues they come into contact with. In this case you would not want to induce vomiting as it will do additional harm on the way back up.

The best bet is to call the hospital or poison control (1-800-222-1222 in the US).

If you cannot call them you should go tot he hospital as soon as possible.