MG Chemicals 4140A Flux Remover for PC Boards, 1 Quart Bottle

Bought the quart bottle (non-aerosol). I use this product in the final cleaning step after using 91% rubbing alcohol because it is expensive but works really well. As others have mentioned, brushing goes a long way towards breaking up flux and releasing it from the PCB. Best advice is to wipe away excess flux then soak the board in a shallow pan or dish for a few minutes then work at it with a brush. The goal is to save solvent and clean the board! Do this a few times before rinsing with solvent or alcohol. After the PCB dries, inspect and work on problem areas again.

In my career, I'd used commercial/industrial flux remover available from my job. Now that I'm retired, my 'free' source was gone :-) but I wanted to continue to do electronics. Based on the MSDS sheet, this solvent is the closest to the commercial/industrial stuff, without the acetone. With no acetone, this flux remover is, in my experience, plastic-safe. If additional 'cutting' is required, I add a splash of acetone (nail polish remover) to get the job done. Very satisfied with the performance, easy to store, no objectionable smell, and inexpensive.

Works well. Better than using alcohol. Kind of expensive for 32oz.

Works great to remove rosin and no clean fluxes but you still need to use a lot to wash away the flux. If you just use a little you will just spread the flux around and leave a sticky mess. At first I thought the board had melted but in fact it was just the flux being dissolved and then spread around by my brush. Make sure to wipe or wash away the flux after the cleaner dissolves it, otherwise after the solvent evaporates it will leave the flux behind.

If you are needing to clean up your PCBs and your are currently using Iso 99%, a good flux remover is a must. Iso can clean up a board in a pinch and works ok on solvents, but doesn't actually remove most flux, it tends to just smear it around. I have been using this on TH and SMD, and have been happy with the results. I use Flux-Off spray as well, its a bit more convenient in some cases but it tends to get wasted and is more $$ compared to the MG brand.

I wiped flux all over a controller board and used a paper towel to wipe off what I could, then I used IPA 91% and kimtech wipes and it came off super clean. Then I poured some into a small plastic kitchen container I bought for my ultrasonic machine, and it came out great. Had a bit of a shine to it, so I tested and there was a film, I put it in a rinse bath of warm distilled water and it looked like a brand new board.

This is my go to remover. Works like a charm! Big bottle will last me probably 6 months.

As the title states, it cleans electronic rosin flux off well and leaves no residue. It's also much cheaper to buy it like this then in aerosol cans. I use a small chemical dispenser bottle to apply it then a small hog hair brush to scrub it in the PC board. Then a paper towel to blot away the moisture. It air dries quickly after that leaving a clean shiny board. I've used this product for many years. It's as good or better then Chemtronics aerosol flux off.

This works flawlessly. Easy to apply, and eats through even the toughest of flux residue. I recently tried out some new solder on a test board, and this solder had some god awful quality “rosin” core. My usual 99% IPA wasn’t anywhere near strong enough to shift it. If anything, all it did was smear it in, and make an even bigger mess of the board, leaving a very sticky, grimey residue. This stuff however, cleans off the flux like it wasn’t even there in the first place. I will note, there is probably a technique to how you use this. I personally used an ESD brush, and painted it on to the PCB over the kitchen sink. I then thought it would be wise to rinse it off with some IPA. (Remember what I said about the IPA earlier?) well, the flux re-accumulated on the board, and in the kitchen sink. Leaving that horrible residue everywhere! So for my next round, I reapplied the flux remover (with the same brush) and dabbed it dry with a paper towel. This time, no mess, and I was pleasantly surprised to see a nice clean PCB afterwards. This stuff does have a little bit of a scent to it, but it’s nowhere near as pungent as my 99% IPA is. Given that most of my soldering supplies are from Amazon (flux and solder) you can’t always garuntee that they will clean off the way they say they will. In fact, most of the stuff I purchased said IPA would do the job; it didn’t. But I am certain this stuff will take care of it all! Well worth the money. And should I run out, I’d get more in a heartbeat!

Great - does what it says on the bottle

So much better than standard Isopropyl Alcohol at any strength. I have been using 99% IPA for years with my soldering, but decided I wanted to in the words of Inglorious Bastards - Go Pro. And this stuff has upped my game. IPA while doing a great clean up, cannot quite get that last bit of residue left behind. I thought it did until I started using this. Then you realise this gets you PCB spotless. Worth every penny, and will last for ages.

Cleans the circuit board of flux perfectly with no residue