If your like me and you like to use a lot of flux when reflowing an SMT project board but you know it can be messy. I'm pretty much a fluxaholic you never can have too much. But cleaning the board of its sticky goop can be daunting. Ready made flux cleaners are expensive so I found a cheap solution. Just mix 50% acetone with 50% alcohol in a small pan and use an acid brush (Careful not to ignite yourself the mix is flammable) If your careful you shouldn't have any problems just don't smoke while cleaning. Follow safety instruction on the cans for the acetone and alcohol.