Alternatively, like TikToker @wiltshire.renovators, you could use a strong cleaning product such as Elbow Grease and then scrub the walls with a damp sponge or cloth.
Whichever method you choose, you’ll see the stains seeping out of the walls and pouring down to the floor - this is why you need to line the floor with plastic, or even newspaper, before you start.
The TikTok blogger, whose video got more than 136,100 likes, said it is important to refresh the water you’re using to wipe the walls with. This will help you to get rid of as much residue as you can.