Say No To Cat Pee Outside The Door And Porch by: Anonymous
You'll find Cats will not wee or poo where you've poured vinegar. Ok so it smells of vinegar, but only for about a day. Let the vinegar evaporate and dry out. End of problem.
You MUST clean the area first of any elimination waste and dry the area before you pour the vinegar. I buy the vinegar at superstores in GALLON cartons. It only costs £3 (about $4) and you get many applications from it if you have alot of areas to treat.
My wife says I put too much vinegar down, but at £3 it doesn't bother me. My way of thinking - the more you put down the bigger and better the effect.