Best Drain Cleaner For Cast Iron Pipes

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 1L)

Spear Jackson Heavy Duty Sink and Drain Unblocker Gel - Powerful Formula- Indoor and Outdoor, 5 l (Pack of 1)

Caustic Soda

Zep Commercial Unblocker Heat Drain Liquid

Zep Drain Bioclean & Odour Control - 1l, Drain Unblocker For Preventive Maintenance to keep a drain unblocked, Perfect Drain Cleaner For Bad Smells, Sink Cleaner For Smelling Sinks, Zep Commercial

Powerful Caustic Soda Drain Cleaner(1kg) | Effective Clog Remover, Industrial Strength Formula, Fast Action

MultiWare Drain Unblocker | Sink Unblocker | Heavy Duty Drain Cleaner | Toilet Unblocker | Dissolves Clogs Grease Hair Soap | Easy To Use | Safe For ALL Pipes (1)

Spear and Jackson 2 x 500ml Heavy Duty Sink and Drain Unblocker

Black Swan 51999 PCDC Powder Crystal Drain Cleaner, White, 15.24 cm*10.32 cm*10.32 cm

Chemiphase Drainklenz - Non Acid Drain & Pipeline Cleaner/Descaler - 20 Litres