whats best way to clean bike leathers ?

[phillywilly]

just won a two piece set of bike leathers from flea bay and the white part of them on the sleeves (tri coloured leathers ) are partly dirty , but im impatient so dont want to send off on internet for this miracle cleaner or that miracle cleaner - just want something local shop would stock ..ie halfords or supermarket  :rolleyes  i know , i know !
what about warm soapy water and nail brush ?
also after cleaning them what is a good way of treating them ?
cheers guys and girls .....ooh did that sound too much of a jimmy saville quote  :evil :lol