
One of the worst culprits I know was castrated, so much so I refused to have him to stay.
It can make things worse as for some it is a confidence booster to have their scent everywhere. It is also a training issues an I would confine the culprit If I was unable to strictly supervise, and at other times tell them off if they even so much as looked like trying it. they have to learn that it is unacceptable like any other behaviour you train them not to do.
Of course the scent needs to be removed from the prefered marking spots and access to these limited.