DESCRIPTION
Twice the strength of the 3%, for the jobs where the standard bottle has not quite done it. Six percent is what people reach for on set-in stains, discoloured grout and stubborn marks on hard surfaces. The extra concentration means extra care: it is more likely to bleach fabric and more irritating to skin, so gloves are sensible and a patch test is not optional. Like all peroxide it breaks down into water and oxygen and degrades in light, which is why it comes in amber glass. A 100ml bottle, stored upright somewhere cool and dark.