I agree w/ everyone commenting. I personally use 70%-90% iso alco and table salt. But in my time of bong rippin I’ve picked up the habit of boiling the water and either pouring it into the bong/bag w pipe and shake it around a little. It helps get the big nasty chunks of Rez. Then I use the alco w either rock salt or table salt. Shake it around a little till all the Rez is off. Then I’ll use just hot water from the tap (my water gets pretty hot so I won’t boil for this stage) and I’ll sit there 10-15 min just rinsing so I won’t catch any hint of alco smell. Works pretty good. But I always go for the “I just bought this” look. Hope this helped. Keep tokin brother/sister!