Members who reacted to message #2

Hi guys,
I have a friend who have a satria. He needs some help, his radiator always dispence water with yellowish/rust color. His mech asked him to weekly start his car and put a hose of running water to replace the dirty one. He have serviced his radiator around 6 months ago. Is there any solution for this. Solutions like radiator shampoo if it exist. Help will be very much appreciated. Thanks.