Laundry Tip: How to safely make your own bleach gel DIY Bleach Gel Print Prep time 2 mins Cook time 2 mins Total time 4 mins A little cornstarch, water and a few tablespoons of bleach make this homemade version of a bleach pen. Author: Debbie at Me and My DIY Recipe type: Laundry Ingredients ¾ cup water 3 Tbsp corn starch 4-7 Tbsp household bleach Instructions Mix water and corn starch together in a small pan. Bring to a boil, stirring continuously until mixture becomes translucent and pudding-like. Let cool. If you need to make it more than a few hours ahead of time, cover the pot with plastic wrap so it won’t dry out. Start adding bleach by the Tbsp, until you have the consistency and strength you desire. Gel will thin a little bit after sitting. Use as you would regular bleach gel.