Who uses their outdoor table without wiping it down first? Ew.
I've just watched two robins shit on it, and a blue tit and great tit gang chase a lone sparrow off it that involved much flutterings and contact and poo..
I think the squirrel has sat on it, which means he's rubbed his botty on it and probably his nuts too..
I don't get foxes or cats in my garden, but we do have rats, mice, squirrels, birds etc when the dogs aren't looking (or are asleep out there in the sun).
Outdoor cats should really be kept in your garden by catproofing the fencing or in a catio/cat run (a catio btw is an enclosed patio, wood frame, wire mesh, that you can go and sit in and so can your cats. A cat run is more a wooden frame attached to the house with a catflap to it that the cats would use but you wouldn't.)
The risks to outdoor cats are pretty high - shot, run over, killed by other cats, foxes, birds of prey, stolen by arseholes, poisoned... thats not a risk I would take with my pets.