A wet cleaning apparatus, comprising: a dirt inlet; a motor and fan for delivering suction to the dirt inlet; a separator unit (18, 118) for separating water and/or dirt particles from a flow of air generated by the suction; a collection volume for collecting the separated water and/or dirt particles, wherein the separator unit comprises: a flow path member (36, 136) having an interior surface portion (36A, 136A), the flow path member being arranged to change a flow direction of the flow of air such that the water and/or dirt particles are flung against the interior surface portion and thereby separated from the air; and an outlet member (38, 138) extending from the flow path member to an opening, wherein the outlet member is arranged to guide and accumulate the separated water and/or dirt particles towards a region (52, 152) at the opening from which the separated water and/or dirt particles flow towards the collection volume along a first flow path when the apparatus is orientated for use; and an air passage for passing the air separated from the water and/or dirt particles towards the motor and fan, the air passage being spaced apart from the outlet member and the collection volume, a second flow path being defined between the opening and the air passage, which second flow path is directed away from the first flow path. a dirt inlet; a motor and fan for delivering suction to the dirt inlet; a separator unit (18, 118) for separating water and/or dirt particles from a flow of air generated by the suction; a collection volume for collecting the separated water and/or dirt particles, wherein the separator unit comprises: a flow path member (36, 136) having an interior surface portion (36A, 136A), the flow path member being arranged to change a flow direction of the flow of air such that the water and/or dirt particles are flung against the interior surface portion and thereby separated from the air; and an outlet member (38, 138) extending from the flow path member to an opening, wherein the outlet member is arranged to guide and accumulate the separated water and/or dirt particles towards a region (52, 152) at the opening from which the separated water and/or dirt particles flow towards the collection volume along a first flow path when the apparatus is orientated for use; and a flow path member (36, 136) having an interior surface portion (36A, 136A), the flow path member being arranged to change a flow direction of the flow of air such that the water and/or dirt particles are flung against the interior surface portion and thereby separated from the air; and an outlet member (38, 138) extending from the flow path member to an opening, wherein the outlet member is arranged to guide and accumulate the separated water and/or dirt particles towards a region (52, 152) at the opening from which the separated water and/or dirt particles flow towards the collection volume along a first flow path when the apparatus is orientated for use; and an air passage for passing the air separated from the water and/or dirt particles towards the motor and fan, the air passage being spaced apart from the outlet member and the collection volume, a second flow path being defined between the opening and the air passage, which second flow path is directed away from the first flow path.