all that 420 solution is, is salt and alcohol, and some shit to turn it blue. I bought that shit once and used nearly all off it cleaning my bong once. all the salt settles to the bottom and separate from the alcohol and u cant control the water:salt ratio. and the salt granules are too small, like table salt. Always try to use sea salt if you can, sometimes, sea salt granules are too big too fit, in which case you have too use table salt. When i clean my bong, sea salt is too big to get inside the perks, so i have to put table salt and and alcohol in from the top and blow down to get the mixture into the perks. a little sea salt a little rubbing alcohol(enough to keep the salt granules sloshing around), and shake it up,