FOI NBC Defence has carried out several trials on the decontamination efficiency of C agents for different paint systems used by the Swedish defence forces. In order to gain experiences a first trial on the decontamination of B agents has been undertaken. Simulants of three B agents were used; bacteria (Erwinia herbicola), virus (MS2 fag) and spores (Bacillus subtilis). Decontaminants were the Finnish E-95 and the Canadian CASCAD. The equipment used and the handling of this was according to specification. Hot water was used as a reference. The paint systems used are representative of the systems used by the defence forces. The results necessitated a second test series, including sampling from the first water used for flushing. This series used two simili substances for spores (B.subtilis and B.thuringiensis). Flushing with water reduces the number of organisms on the plates. Serie 2 shows, however, that not all organisms can be flushed away, although serie 1 indicated they could. Serie 2 shows that the use of decon chemicals gives a further reduction of organisms on the plates, with no difference in efficiency between CASCAD and E-95. No organisms were found in the water used for the second flushing. There were no differences in decontamination efficiency between the paint systems used. The methodology and simili substances used in the study seem to be applicable to studies of this kind. A preliminary test indicates that RSDL(r) could not eliminate B.subtilis.