Style chooser

im using a 1983 e28........
how to cuci da spark plugs?

the plugs are
SPARK PLUGS BOSCH SUPER BP5ES
W8DC

can sum1 teach me any other ways to wash the plugs?
the technique im using now is
i first wash it in petrol.....then i use a tooth brush to wash the head.......then i wash again n use the sand paper to scrap the black stuffz....(if not mistaken is copper oxide) then i wash again.......kau tim.....clean like new....
any other wayz? plz share




*reposting this...