Hi there, I’m looking for a reliable tradesperson to unblock a stubborn kitchen sink drain. The sink occasionally backs up when running hot water, and there’s a mild odor. I’ve tried a plunger and a basic drain snake with limited success. Please include: any fee for materials, a rough timeline, and whether you will need to access under the sink. I’d prefer a reasonable price, punctual arrival, and a brief explanation of the blockage cause and fix. Irish unit preferences and attention to health and safety standards are appreciated.