The way I was taught as a Middle Eastern man was: first use toilet paper at least three times to remove the majority of the material. Secondly, hold the spray hose or the bottle in your right hand and point downwards towards your perineum from the FRONT of your legs. Use your left hand to lift your junk and have two fingers down there. Now pour water over your left hand towards the perineum, and let the fingers carry the water and rub to clean out the ass crack. Usually a single litre water bottle is enough to feel extremely clean and refreshed. This method obviously works better if you’re squatting, but I use it with western toilets too. The most common mistake people make is to try and put their hands behind their back or pour the water from behind - makes a mess and doesn’t clean right. The imagery of the cleaning motion is like a woman fingering herself.