Floor Drains when not properly cleaned regularly can become a breeding ground for Small Filth Flies such as fruit flies and drain flies. Organic materials stick to the sides of the drain forming a layer in which these pests can deposit their eggs. Once born the young lives in this material that they are using as a food source. Throwing bleach or hot water down the drain is not enough to remedy the problem. V+ uses the professional products developed specifically for this issue and has the experience to apply them in order to achieve the best possible results.