How to cleanse a haunted house :-

There is no such thing as ghost, there are only familiar spirits. The evil spirits remain in a place because of defilement caused by sins committed there.
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John 20:23 KJV
Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.
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In above scripture, the original Greek Strong wordings, “whose soever” can refer to a place, or someone. In 1st John 2:2, the sins of whole world is taken by Jesus, even defilements caused by sins in a place. Above scripture is saying we can remit the sins of a defiled place, by declaring what Jesus did.
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1 John 2:2 ESV
He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.
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But we have to believe in our heart & declare the above scriptures to a defiled place. Just like a prebeliever has to believe in his heart , confess with his mouth Jesus died for his sins.
So u can speak aloud:
“I declare the sins causing defilement in this house is removed by Jesus on calvary 2000 yrs ago, His precious blood has washed away all the sins in this place, which caused defilement.” “I declare this house is no longer defile”
“In Jesus’ name , I declare no evil spirits has the right to remain in this house. I command them to leave this office/ house right now! Get out in Jesus’ mighty name!”

Go to every room and say the same text above.
Use anointing oil , anoint the main door’s left & right frame & say, “I plead the blood of Jesus.” No need to anoint the top frame.
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Exodus 12:23 ESV
For the Lord will pass through to strike the Egyptians, and when he sees the blood on the lintel and on the two doorposts, the Lord will pass over the door and will not allow the destroyer to enter your houses to strike you.
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The Lord will disallow any unclean spirits from returning.