Holidays and Traditions Is it safe to use hot water to unclog toilet? Is it safe to use hot water to unclog toilet? Hot Water and Dish Soap When the water is extremely hot, but not boiling, pour into the toilet carefully. Wait for 10-15 minutes while the dish soap and hot water soften the clog. Once you do so, the toilet will unclog and flush freely.8 jun 2021 Related Posts:How to remove yellow stains from toilet seat and bowl.How to remove yellow stains from toilet bowl and seatCan you flush paper towels safely?How do you unblock a toilet with a wire?