Hydrogen peroxide (H2O2) and methylhydroperoxide (CH3OOH) are studied with a coupled gas phase and aqueous phase chemical model representing a remote nonprecipitating cloudy boundary layer. Cloud interactions may deplete or enhance H2O2 but have a minor effect on CH3OOH. Therefore two primary questions are addressed: (1) do nonprecipitating clouds perturb the ratio of H2O2/CH3OOH, and if so, (2) what is the rate of reestablishment of this ratio to clear-sky levels following cloud contact. The results show that the rate of recovery of the ratio of H2O2 to Ch3OOH after perturbation by cloud interactions depends on NOx (=NO + NO2) mixing ratios and on the time of day that cloud is encountered. When cloud contact is followed by a significant period of daylight, recovery to precloud values is rapid; however, when cloud contact occurs during the late afternoon or night, recovery can take up to 24 hours under high NOx conditions. Sensitivity tests show that in-cloud heterogeneous conversion of HNO3 to aerosol has a small but detectable effect (~10%) on the recovery of the ratio. Neglecting dry deposition of H2O2 and HNO3 increases the predicted ratio H2O2/CH3OOH in clear air prior to cloud contact, and has a small effect on the relative recovery rate of the ratio. In-cloud consumption of H2O2 by SO2 suppresses the postcloud ratio by ~40% relative to that in the base case for low levels of SO2 (~200 ppt), with a more pronounced effect on the ratio and its rate of recovery for 2> ~1 ppb. Because of the uncertainties associated with measurement of peroxides, and the dependence of the recovery of the ratio on the time of cloud contact, it is suggested that measurements of the ratio be considered judiciously and that they may not be of broad utility in predicting recent cloud contact.