If some of you are wondering "how do you train a cat?"
Here are some ideas to think about.
Most cats have a vocabulary of words they know and understand.. It may be only a few or maybe more than 50.(because they don't choose to react to them, doesn't mean they don't know them.)
Try this first...
Walk around your house pretending you are your cat. Look where they can nap on a clean comfy place. Look through their eyes. Cats love clean!!! - Which is why they will curl up on new quilts or projects underway, like something being sewed. They also are fond of low open boxes. Ask yourself "If I were Kitty where would I be able to sleep?"
If there is no clean comfy place, maybe in the sun...
maybe you could make it(or them) a clean soft cushy bed from scrap batting and maybe covered with a pillowcase that can be washed and will hold a pinch of catnip as an extra bribe. It can be the ugliest fabric you have and kitty won't care!
To keep them out, a spray of water in their faces and a strong NO! that you realy truly mean will work. Curiously cats have conciences - haven't you seen them look guilty when you catch them doing something forbidden?
Another convincer is a flat piece of newspaper on a ironing board or other sewing surface. Carry a long rolled up piece of newspaper, or leave it handy, and when kitty sits or lays on the newspaper, give the flat newspaper a good noisy whack with the rolled up piece!
SaY NO loudly too. Don't Don't hit the kitty! Just make a sudden loud thwack! Kitty will probably jump off. Pick up the kitty and put it on the newspaper, and thwack the newspaper again. Do this a third time, kolding kitty down. It will run off, and likely will never come back to that place. This is one way people train cats never to get on kitchen counters or tables, or not to go in dangerous places.
Using cat manners - the thwack = your warning hiss, eventually will work with even the worst offenders.