How do I stop a neighborhood cat from leaving it's business on my fron

https://www.wikihow.com/Stop-Cats-from-Peeing-on-the-Front-Porch

Vick's vaporub is something a cat does NOT like. My friend put some under her couch to get the cat to stop scratching and it worked. Put some on a branch or on something inconspicuous near where the cat is leaving its business...it is worth a try. Good luck.

Cats hate the feeling of crushed up eggshells shells on their feet. You could scatter that around the area and see if that deter them?

Feed it Spam - it wont come back guaranteed.

Might try one of these products...

It's updating their marking of territory that he/she left their previous scent. Hose the area down daily to combat the returning practice of updating their claim of territory. They will find a new area to mark.