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I literally just got one as a present this morning. Pretty excited to use it. Sorry that doesn't help you.
I clean all my coffee gear with Cafiza which normally does the trick. It's designed for espresso machines but I use it on everything. Maybe you could ask you local coffee shop if they have any and give it a try?
http://urnex.com/professional/product/cafiza-espresso-machine-cleaning-powder/
Speaking of Espro I bought one of their fancily-filtered metal press things years ago and really liked it for an option to make several cups of coffee rather than my Aeropress. However I went away on holiday and an idiot flatmate decided they would use it as a vase while I was gone and from then on it had a horrible off taste. I couldn't believe it would be that badly affected just from that and convinced myself the rubber had coincidentally perished or something and bought a new filter, but that didn't work. I tried cleaning it with baking soda I think and that did nothing. Is it just fucked? It's been sadly sat in my cupboard since I moved and if there was some obvious trick to fixing it I missed that would be great.