What's a good way to get rid of rats?

My sister has a cottage in a village and its surrounded by a large wild garden area but her kitchen is infested with rats as the door leads directly out into this ground.

Answers:
Traps and poisons are somewhat effective - but they are messy, and more rats may come. Far more effective: get a BLACK SNAKE (or a King Snake) - they snake will take care of the rats for you.

If you don't like this solution, get one of those ultra-sonic pest eliminators. (be sure to get one tuned for rats, not insects) - they work fairly well.

Other answers:
Clean.
Clean.
Without using rat poinson....get a dog or some cats.
blow up the cottage and re build !!
Stricknine
use rat traps with peanut butter
hmm... put poison for them to die!
place rat posion out for them ..keep the kitchen free from food stuffs,,leave nothing out,, and clean up the garden a bit...and a co2 pistol works too
traps, cats, poison all of these should work if used at the same time
Couple of good cats will fix ya right up.
Oh my, this can be a problem. We had one get into our basement last summer and we tried all kinds of things. He/she was too smart to take bait off a snap trap and wouldn't go into a live trap. We finally got it by putting out some sticky paper made for that purpose. I can't remember what it was called but we got it at a feed store. It's like fly paper only bigger. We put some bait in the middle of it and the rat got stuck when it went after it. Even though I didn't like having it in my home, I didn't want to see it suffer so my husband took care of it.
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