In the UK 99.9% Isopropanal is the cheapest and best cleaner and sweetener, can get this on ebay by the litre at very low cost and delivered to your door, after a few hours drying it leaves hardly a trace of any taste, you would be amazed at how much crud this will find with just one dip with a pipe cleaner, I use this with the retort method when restoring any old pipes and it works great, in between major cleans I just run a pipe cleaner through using Deniclean cleaning liquid for pipes, this is an excellent sweetener, I am not one for wasting good Wiskeys and Bourbons ect. though I have done this when away on holiday and it works great but not as good as Isopropanal as a cleaner.