How can I go and get rid of rodents that are contained by the heavens ducts of my house? I have a contract near Orken and they are sending someone out...

I have a contract near Orken and they are sending someone out again. This is the second time that I have have rodents manage to draw from into the air ducts and I am wondering what else I can do save for use Orken, place out traps, and use those sonic devices. My house is built on a slab.
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Get glue traps, and check them twice a week, after find where they are coming within at, and seal up the hole. so nought else can come in.

Potterton Boiler Clock?
Get a cat. Borrow from a friend if nessessary. Keep kitty inthe house for a couple of days, even a few hours a afternoon.
The smell of a cat in the nouns can ward off rodents surrounded by large numbers.

Hmmmm. perchance a little grease around the entrance
Well question- refill a cistern?
Answers:    If you know the area they may be entering you could own 1/2 x 1/2 wire mesh eyeshade put in the duct where on earth they enter. This should keep them from entering the ductwork.