Things you will need:
• One yellow manual cleaning device, also known as "Sponge". Obtained either through box means or from naturally spawning ones in the wild.
• One kitchen, clean or destroyed either one works, has to have walls though.
• The belief or concept that we live in a false reality and the physical constrains of the kitchen space is fabricated by artificial means.
• Insurance from loss of Sponge device.
• Insurance from risk of Sponge uprising.

Follow in-depth step by step:
• Locate and pick up the yellow cleaning device, known formally as "Sponge".
• Locate a vertical surface, known as a "Wall", and collide yourself against it.
• Press the prompt to clean the surface, may have to do so multiple times in rapid succession.
• Result should be camera phasing through the wall and into the open void.

• Unsure if this was covered before but have found bug by accident.
• Sponge has a "zoom-in" feature when cleaning that makes the camera move closer and focus on the object you're supposed to be cleaning.
• Either the camera is not picky on where it zooms to by ignoring the level borders or the levels have many untextured walls outside of play area that allow sponge to latch onto somehow.
• Sponge may be lost when trying this, it clips past the playable area when performing this bug and it sometimes does not clip back in.
• Makes you wonder why the levels have a full-sized skybox outside of the area visible to the player, maybe this is why the game about cooking food in small kitchen requires 4-8GBs of VRAM to run decent.