Hm, who is this mysterious homebrewer you type of?
If it's chlorine, it will be its most noticeable in the burning-band-aid burps (tks Sacc). Also, I get an awful hit of plastic when I taste beer that's been sitting in my picnic tap line. I just dump the first ounce of the session.
Are you using beer line or generic pvc?
I may not be an expert, but I did stay at a Holiday Inn Express........ 6 months ago.