Sooo i need sme help on allergies, 10 points best answer :D?

okay(: so my best friend is due to spend the night for the first time in YEARS in three days. see i always spend the night at er house because she is DEATHLY allergic to cats, and we had a cat but she was givin away several months ago. since then we watched my sister's cat for a couple of days. this was several weeks ago and the cat stayed mainly in the laundry room b\, but also in my room. my question is what are some things i can do to sterilize the house,? vacuum, mop, wash my bedspread? please help because i want to make sure she can have an enjoyable time here. thankyou so much,:D