help ich won't go away!

[dave2010]

Hi I've been battling ich for around 2 months now, I've tried everything I can apart from using salt because I have scaless fish such as my pleco and loach. I've tried esha exit and esha 2000 I got through both bottles and there was still ich I have had the temperature turned up for weeks and I've been using a different ich treatment by interpet and the ich still won't die, I have done daily water changes and have used my net to remove as much visible ich as I can when its floating round the tank. I've head something about a fresh cold water dip that will make any ich drop off its host in 20 seconds! Is this true? Can someone help plz!