Spent 2 years cleaning flux with the wrong kind of brush until a repair buddy set me straight

So I'm working on this old receiver from the 70s, covered in that crusty rosin flux, and I'm scrubbing with these cheap nylon brushes from Harbor Freight. My buddy walks in, takes one look, and asks why I'm leaving a fuzzy residue everywhere. Turns out those brushes were way too soft and had fibers that just smeared the flux around instead of lifting it. He handed me a horsehair brush he bought for like 5 bucks at an art supply store near Denver, and the difference was night and day. Has anyone else had a similar facepalm moment with a basic tool you thought was fine?

3 comments

3 Comments

max_ross11d ago

Bought a so-called "electronics brush set" off Amazon once. Three different sizes, all useless. Left more fuzz on the board than the flux had originally. Ended up using an old toothbrush that my roommate's cat had obviously been chewing on. Worked better than the ones I paid for. Some lessons only stick after you waste twenty bucks.

patricia_schmidt1411d ago

My buddy Darren spent a whole weekend scrubbing a vintage Marantz tuner with those yellow dish scrubby sponges. He kept complaining about these weird white streaks that wouldn't come off no matter how much alcohol he used. Turns out the scrubby side was too abrasive and it was actually sanding the solder mask off the board in spots. The white stuff was just bare fiberglass showing through. He didn't realize until his cat knocked the sponge into the toilet and he had to run out to the hardware store for something else instead.

derek65610d agoMost Upvoted

Right? It's wild how the easiest fix can be the worst one. @patricia_schmidt14, that story reminds me of how often the most common thing in your house is never the right tool for the job, you know? Like grabbing that sponge is just instinct, but it'll wreck a board faster than anything.