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In summer, 2013, one site of a fenny bog covered with an 20-year-oldasphalt-like oil crust was provided to us as a trial field for our anaerobic-aerobic method of bioremediation with the application of the oil-degrading preparation “Rhoder” and an acceptor of electrons in spite of the fact that this method was developed for bioremediation of fenny bogs polluted with fresh crude oil. After the first treatment of the crust with the "Rhoder" and fertilizers, it became clear that without destruction or softening of a crust it was impossible to receive significant reduction of this pollution. It was confirmed with the results obtained on the allotment where the anaerobic-aerobic method of bioremediation was performed. The use of machinery on such bogs was unacceptable for the destruction of the crust and there was a question to choose some reactants for softening this asphalt-like crust and then carry out the anaerobic-aerobic method of bioremediation of the bog. Preliminary researches showed that solutions of reactants with concentrations of active components of 20% and 10% sharply lifted рН of soils, and thus the total amount of microorganisms was very much decreased. Therefore the reactant "A" in the experiment on the peat with the asphalt-like crust was taken in lower concentrations and applied several times. The reactant "B" was taken in concentration of 3.5% and used only once. As a result of conducted researches the concentration of HC (Hexane fractions) managed to be reduced by 46-47% after application of the optimized amount of the softening reactant “A” or “B” instead of former 23% without any reactant, and we could choose the better of two reactants.