To clean your stomach in 5 minutes you can drink some warm lemon water, water with apple cider vinegar or even some ginger tea.
Drinking some warm lemon water, water with apple cider vinegar or ginger tea can stimulate your digestive processes and also help to relieve bloating.
You can also do a 5 to 7 minute abdominal massage as well to stimulate bowel movements and help you poop.
To drink warm lemon water to clean your stomach in 5 minutes or to clean your stomach in genera, mix some lemon juice or half the juice from a lemon into a cup of warm water, then stir it and drink it to stimulate digestion.
Ginger tea is also great for speeding up gastric emptying and cleansing your stomach and digestive system including your colon.
For apple cider vinegar to clean your stomach and digestive system, mix 1 to 2 tablespoons of raw apple cider vinegar in 250ml of water to aid in digestion and clean your stomach.
For an abdominal massage you can lay on your back, and apply some gentle pressure and move in a clockwise direction to massage along your colon for 5 minutes to 7 minutes.
Although just note that there's no drink that is proven medically to flush out toxins from your stomach in just a few minutes, as the liver and the kidneys also do this to keep your stomach and digestive system clean continuously, but drinking these drinks can help.
A risky method of cleansing your stomach is to use saltwater flushes, although they can cause vomiting, cramping and severe diarrhea and should be avoided.
For better results on keeping your stomach clean and cleaning your stomach and digestive system, you should focus on consuming fiber and probiotics and remain hydrated by also drinking plenty of water.