  Cosmic ray (CR) interactions can be a challenging source of background for
neutrino oscillation and cross-section measurements in surface detectors. We
present methods for CR rejection in measurements of charged-current
quasielastic-like (CCQE-like) neutrino interactions, with a muon and a proton
in the final state, measured using liquid argon time projection chambers
(LArTPCs). Using a sample of cosmic data collected with the MicroBooNE
detector, mixed with simulated neutrino scattering events, a set of event
selection criteria is developed that produces an event sample with minimal
contribution from CR background. Depending on the selection criteria used a
purity between 50% and 80% can be achieved with a signal selection efficiency
between 50% and 25%, with higher purity coming at the expense of lower
efficiency. While using a specific dataset from the MicroBooNE detector and
selection criteria values optimized for CCQE-like events, the concepts
presented here are generic and can be adapted for various studies of exclusive
{\nu}{\mu} interactions in LArTPCs.
