A system comprising a groove of a turbine rotor disk, and a tool for cleaning the groove, the tool comprising: a pair of guides spaced apart from one another in a direction of a longitudinal axis of the tool, wherein at least a portion of each guide has a cross-sectional profile corresponding to at least a portion of the cross-sectional profile of the groove, wherein, when the guides are inserted into the groove, the direction of the longitudinal axis of the tool corresponds to the direction of a longitudinal axis of the groove; and a plurality of cleaning sheets positioned between the guides in the direction of the longitudinal axis of the tool, wherein at least a portion of each cleaning sheet has a cross-sectional profile corresponding to another portion of the cross-sectional profile of the groove different from the at least a portion of the groove and of each guide: wherein each cleaning sheet comprises a plurality of recesses extending in the direction of the longitudinal axis of the tool, and a plurality of shoulders extending in the direction of the longitudinal axis of the tool; wherein each cleaning sheet comprises: a bottom surface positioned along a bottom side of the tool; a plurality of laterally-outer surfaces positioned along lateral sides (112, 114) of the tool; a plurality of laterally-inner surfaces positioned along the lateral sides (112, 114) of the tool; a plurality of top-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing a top side of the tool; and a plurality of bottom-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing the bottom side of the tool; wherein each cleaning sheet comprises one or more contact portions configured to contact one or more surfaces of the groove, when the guides are inserted into the groove, and one or more non-contact portions configured to not contact remaining surfaces of the groove; and wherein each contact portion comprises a plurality of fingers, and a slot separating each adjacent pair of the fingers. a pair of guides spaced apart from one another in a direction of a longitudinal axis of the tool, wherein at least a portion of each guide has a cross-sectional profile corresponding to at least a portion of the cross-sectional profile of the groove, wherein, when the guides are inserted into the groove, the direction of the longitudinal axis of the tool corresponds to the direction of a longitudinal axis of the groove; and a plurality of cleaning sheets positioned between the guides in the direction of the longitudinal axis of the tool, wherein at least a portion of each cleaning sheet has a cross-sectional profile corresponding to another portion of the cross-sectional profile of the groove different from the at least a portion of the groove and of each guide: wherein each cleaning sheet comprises a plurality of recesses extending in the direction of the longitudinal axis of the tool, and a plurality of shoulders extending in the direction of the longitudinal axis of the tool; wherein each cleaning sheet comprises: a bottom surface positioned along a bottom side of the tool; a plurality of laterally-outer surfaces positioned along lateral sides (112, 114) of the tool; a plurality of laterally-inner surfaces positioned along the lateral sides (112, 114) of the tool; a plurality of top-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing a top side of the tool; and a plurality of bottom-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing the bottom side of the tool; wherein each cleaning sheet comprises a plurality of recesses extending in the direction of the longitudinal axis of the tool, and a plurality of shoulders extending in the direction of the longitudinal axis of the tool; wherein each cleaning sheet comprises: a bottom surface positioned along a bottom side of the tool; a plurality of laterally-outer surfaces positioned along lateral sides (112, 114) of the tool; a plurality of laterally-inner surfaces positioned along the lateral sides (112, 114) of the tool; a plurality of top-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing a top side of the tool; and a plurality of bottom-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing the bottom side of the tool; a bottom surface positioned along a bottom side of the tool; a plurality of laterally-outer surfaces positioned along lateral sides (112, 114) of the tool; a plurality of laterally-inner surfaces positioned along the lateral sides (112, 114) of the tool; a plurality of top-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing a top side of the tool; and a plurality of bottom-facing surfaces positioned along the lateral sides (112, 114) of the tool and facing the bottom side of the tool; wherein each cleaning sheet comprises one or more contact portions configured to contact one or more surfaces of the groove, when the guides are inserted into the groove, and one or more non-contact portions configured to not contact remaining surfaces of the groove; and wherein each contact portion comprises a plurality of fingers, and a slot separating each adjacent pair of the fingers.