SDG 3 and SDG 315 are proprietary decontamination agent, which can be used dissolved in water, or applied as a solid cream, then washed off afterwards.  The latter technique is more typical.  SDG 3 is mainly used for decontaminating equipment items where immersion in a decontamination solution is either impractical or unadvisable.

SDG3 has been superseded by other decontamination creams – SDG315 or N10