Just to
throw my input here, as I asked pretty much the same question when I first got my 501 2 days ago...
A lot of people told me many different things to do, such as soaking them in Coke overnight, soaking them in water, soaking them in 151, blowing them out, etc...
I found that just blowing them out (until nothing else is on the tissue) didn't COMPLETELY get rid of the taste, so I soaked both of mine in water overnight, and then blew the water out the next morning. This did the trick for me.