i use ardell red/gold corrector -- i add it to a conditioner, let it sit on my hair while i shower. i only do it periodically, like once a week. i got the idea from jeepcurlygurl. others use commercial blue shampoos but i found them to be very drying. this works perfectly for me. i buy it at sally's beauty online. you can see more about yellowing/care for on the thread, 'our grey journey,' and lots other threads. do a search.