The invention relates to a process for permanently perfuming soapnut shells and improving their washing efficiency, during which process the soapnut shells are treated with effective microorganisms and a perfume material. The invention furthermore relates to preparations based on the soapnut shells produced by the process according to the invention, powdered and mixed with various substances, which preparations serve as additives to the treated soapnut shells used for washing, further improving their cleaning, colour-brightening effect, and helping to keep the washing machine clean. The soapnut shells produced by the process according to the invention retain their smell for at least two years, and the clothes washed with them will have a lasting fresh smell.
