Everyday for 1-3 weeks boil your kettle, , put 3-4 capfulls of your household disinfectant in the jug & fill the jug with boiling water…it must be boiling hot, then slowly pour that down your drain, everyday for 2 weeks & you will notice the smell decreases after 2-3days then stops within the 1st week then whole 2 Weeks

The problem is caused by the Trap underneath not being directly underneath the drain pipe or junction & instead being slightly off its correct position. This method successfully flushes out the trap unlike everyday hot &/or cold ‘tap water’ when draining away.