Press the living room light switch.

Use the spray on the jelly next to the TV.

Use the bucket on the bathtub faucet.

Combine the special item with the bucket of water.

Combine the rag with the prepared bucket. 

Use the wet rag on the stain in the living room.

Press the second, the first, and then the third button on the thing next to the entrance in sequence.

Take the key.

Use the key on the car trunk.

Interact with the cellar door.

Take the bobby pin from the head in the bathtub.

Take the paperclip from the desk in the single bedroom on the first floor.

Take the pliers from the pegboard in the garage, next to the car.

Combine the pliers with the paperclip.

Interact with the cellar door to unlock it.

Interact with it again to open it.

Take the drawing with three holes from the wooden crate in the cellar.

Now you can interact with the safe located behind the second door on the first floor. 

Go to the living room and with the light on, use the drawing on the painting. 

Moving it to the position shown in the image below will reveal three numbers: 237.

Enter the numbers into the safe.

Open the safe.

Return to the cellar and move closer to the chairs.

Leave the cellar.