I have a 3 year old Ariston washer dryer machine and the metal casing of
it has turned slightly yellowy. The plastic trim parts are all bright
white so the difference in colour really stands out! I have tried to
clean the machine using standard 'spray' kitchen cleaners which has had
no effect at all in removing the yellow tinge. I therefore have two
questions! 1, is there any product that i should be looking at that
would successfully clean the machine, or 2, would it be
possible/advisable to spraypaint the machine back to white?? Any other
solutions would be gratefully received!

Many thanks