"They took all my electronic things, TV, my Hi-Fi system, Xbox," he said.
The occupants left greasy motor oil all over the laundry floor, walls and even ceiling. Photo / 7News
One woman had given her name as Ruby – a name which has now been passed on to police.
People on Facebook shared their disgust about the situation, while others offered to help Vijaya.
"When you give some people something for nothing they don't appreciate it, they care nothing for it," one person commented.
Vim Vijaya offered the Perth family free accommodation after they told him their previous house had burned down. Photo / 7News
Another wrote: "I'd be happy to come and clean out the air conditioner for free for you mate."
"That poor man only doing it out of the kindness of his heart … who does this to someone. I hope he gets compensated for this. I'm also happy to help clean his home if he wants a lending hand that's a lot to clean," one woman said.