Patent ID: 6951221

Claim:
An apparatus for removing residuary pollution from a substrate, comprising: a) a spin mechanism for holding and rotating said substrate; b) a remover liquid supply unit for supplying remover liquid onto said substrate being rotated to remove said residuary pollution from said substrate, c) a deionized water supply unit for supplying a deionized water onto said substrate being rotated; and d) a controller comprising a first control procedure element for controlling said remover liquid supply unit to supply said remover liquid onto said substrate being rotated and then stop the supply of said remover liquid, a second control procedure element for controlling said spin mechanism to rotate said substrate for a predetermined time period after the supply of said remover liquid is stopped to disperse said remover liquid from said substrate, and a third control procedure element for controlling said deionized water supply unit to supply said deionized water onto said substrate being rotated after said remover liquid is dispersed, whereby pH shock due to mixture of said remover liquid and said deionized water on said substrate is substantially prevented.