If it is furniture that can't be cleaned with water, we can put it in a sunny place and let the sun shine on the second-hand furniture, which can also remove the aura of the previous owner, no matter good or bad.
Also, you can put the second-hand furniture in a well-ventilated place and let the air blow away the good luck and bad luck left by the second-hand furniture.
Second-hand furniture is not unusable, it just needs some feng shui purification to prevent other people's gas field from affecting your fortune.