While bleach can help eliminate drain fly larvae, it is not an effective solution for eradicating these pests completely. The problem lies in the thick layer of eggs deposited by female drain flies. Bleach fails to effectively penetrate this protective layer, rendering it ineffective against the eggs. Additionally, bleach quickly washes away down the drain, limiting its contact time with the eggs and reducing its efficacy. To effectively get rid of drain flies, it is crucial to focus on eliminating their breeding grounds and addressing the underlying issues in the drains. This involves thoroughly cleaning the drains using specialized drain cleaners or enzyme-based products that can break down the organic matter and debris where drain flies thrive. Proper sanitation practices, such as regularly removing standing water and ensuring proper ventilation, can also help prevent future infestations. While bleach may have some limited impact on drain fly larvae, it is not a reliable solution for complete eradication. Employing comprehensive cleaning and prevention measures is key to effectively combating drain fly infestations.