it costs about 60 pence and lasts ages,does the baking soda. plus it works ive tryed it a few times, only ever once or twice a grow. dep what the ph is,
lemon juice?. ive herd of people useing cheap crappy lemonade thats that about 29p per 2 liters. that does the same thing, but ive never done it, but i know a few that have, and swear by it, but. i wouldnt want to try it. i dont know enuf about it.