| 摘要 |
<p>A process for bleaching and/or providing limescale removal at a surface, comprising applying to that surface an aqueous composition of hydrogen peroxide or an organic peracid, which composition has a pH of 2 or less and comprises a mixture of (a) an aqueous composition comprising hydrogen peroxide or an organic peracid having a pH of greater than 2 but less than 7 (hereinafter component (a)), and (b) an acidic composition (hereinafter component (b)), wherein components (a) and (b) are mixed not more than two hours before being applied to the surface requiring bleaching and/or limescale removal.</p> |
