Greetings @Amberleic!
You got some great advice here- I’m seconding the vote from @Amethyst for trying a musical cleanse with WOKE NATION- they are fantastic 
There’s also using the purifying sound of Tibetan Singing Bowls to banish any negative energy:
If you’ve tried several methods of cleansing to no avail, you could try to contact (pendulum, Ouija Board, etc) any spiritual presences there or could try another approach with a Home Blessing:
Wishing you all the best- hope you can cleanse the space and find peaceful energy in your home!
Blessed be 