I cleaned my pipe and a friends..both are like 3 years old..I clean mine constantly...I hate the taste of resin on a green hit and love the look a fresh clean pipe..lol I just mix some alch (I used rum last time..) super hot water (cause the alch was room temp) and a little epson salt (I heard some one say the salt helps..i'm not sure if it did)...Let both of them sit in the water/salt/rum for a good 20 mins (5 mins of microwaving when the water n shit cooled down (smoked a J and played some xbox)..then i washed 'em out in the sink..got most of the resin out and i just finished 'em up with paper towels, paperclips and q-tips... cleanest both of them have been since they were new..lol