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A treatment procedure for pastel drawings, developed at the Portuguese Institute of Museums and Conservation (IMC), involves alkaline blotter washing in a humidifying chamber. This method is compared with three other techniques outlined in the literature: immersion in cold water, a combination of water mist and suction table treatment, and ultrasonic mist combined with a dry blotter support. The study applied these four treatments to both non-aged and aged test samples, encompassing three paper types and four pastel sticks, totaling 120 samples. The effects of these treatment methods were assessed using six semi-quantitative parameters determined by visual observation (i.e., lateral pigment movement, paper staining, pigment loss, decrease in color intensity, darkening, and change of hue). Additionally, three semi-quantitative parameters were evaluated through optical microscopy and scanning electron microscopy (pigment agglomeration, compacting, and penetration into the paper support). The findings indicate that the IMC method may not be suitable for treating pastel drawings executed on papers with low porosity. However, among the tested methods, it proves to be the most advantageous technique for treating pastel drawings executed on velour paper—the prevailing type of carrier for pastel drawings treated over the years at IMC.