Mr Muscle Drain Unblocker, Sink & Drain Cleaner, Fast Acting Heavy Duty Drain Gel, Dissolves Clogs, Works 3x Better Than Bleach, Safe for All Pipes, Duo Pack (2 x 500ml) : Amazon.co.uk:
Caustic soda-based liquid drain opener | Starwax, cleanliness of the house
Sink and Drain Unblocker Super Strong Formula Cleaner 1 Litre Quick Drain Opener