Mr Kowalczyk went to the Police Station.
He said the the desk sergeant "I need the help of the Police"
"Why?" came the reply
"My wife is trying to kill me" said the complainant, "Come to my house and I'll prove it to you".
After the paperwork was completed, a constable duly accompanied Mr Kowalczyk to his home.
"Look in the pantry" exclaimed the chap. "the evidence is there!"
The constable checked carefully but could find nothing suspicious.
"Look on the shelf" he was told. There, in the middle. Look at that bottle!"
The policeman checked and then he understood. On the shelf was a bottle labelled "Polish remover"
I'll get my coat