Dr. Beckmann Service-it Deep Clean washing machine cleaner 250g

The number one seller in Amazon's whole Home & Kitchen category: a single use powder that cleans the drum, seal and pipes of a washing machine. 50,000 people bought one in the past month. Amazon has it at £2 against a £3.49 RRP; no high street price could be checked for it today, so this one is a was and now deal.

Cheapest right now: Amazon, £2