Toilet Brush & Holder Set – White…. Tip for a clean loo:- MOST IMPORTANTLY, make sure you close your mouth when you push water into the toilet bowl with a toilet brush – To clean a toilet effectively, it is best to lower the water level in the toilet basin first. To do this plunge the toilet brush down towards the waste pipe, this creates a vacuum and the water level drops. Once the water level is lowered apply the cleaning liquid (Try ‘2506’ toilet cleaner) The liquid can now reach any build up of limescale or soiling without being diluted by the water first! Thus a clean toilet with less trouble.