1. A method for processing formation tester data, comprising: obtaining the formation tester data, wherein the formation tester data are time domain data acquired with a formation tester in a wellbore; transforming the formation tester data into a second domain other than the time domain to produce transformed data; identifying distortions in the transformed data; removing the distortions from the transformed data to produce de-noised data; and transforming the de-noised data from the second domain back to the time domain to produce cleaned-up formation tester data.