MG Chemicals 409B Electrosolve Zero Residue Electronic Contact Cleaner, Clear 15.45 Fl Oz

I picked up the MG Chemicals 409B Electrosolve Zero Residue Contact Cleaner (15.45 fl oz) to clean some old, dusty mining rigs, and it worked wonders. After months of running 24/7, my miners had collected a ton of dust and grime, and this cleaner made them look and perform almost like new. What I really like is that it dries quickly without leaving any residue, so I don’t have to worry about moisture or film causing shorts. It’s safe on plastics and electronics, which is perfect for circuit boards, fans, and power supply connectors. The spray nozzle makes it easy to get into tight spots, blowing away dust and cleaning contacts thoroughly. ✅ Pros: Zero residue formula — safe for electronics Cleans dust, dirt, and oxidation from boards and connectors Quick-drying, no waiting around Large 15.45 fl oz can lasts a long time Works great on mining rigs and other electronics ❌ Cons: Strong odor while spraying (use in a ventilated area) 💡 Tips: Always power down and unplug your miners before cleaning. Use short bursts instead of long sprays to avoid over-saturation. Do this cleaning outside or in a well-ventilated area. Pair with a can of compressed air for best results — blow out dust first, then use the cleaner on contacts. Bottom Line: The MG Chemicals 409B Electrosolve is a powerful and reliable cleaner for electronics. It brought my old miners back to life by safely removing dust and oxidation, and I’ll definitely keep a can on hand for future maintenance.

I don't know how it works but it does. I opened the hood of my old receiver and accessed the innards side of the volume knob. After Several squirts and a lot of rapid turning of the knob, the crackling sound disappeared.

This is really good stuff for anyone who likes to work on things that are electronic. Potentiometers create Gunk and debris inside of them and this cleans it out. I use this on a marshall guitar amp, my washing machine, and a few other electronics that I decided to clean just because. Works really well.

I have used MG Chemicals contact cleaner for many applications over the years and it works very well. It is available in residue and non-residue formulas. The "residue" is a lubricant that is left behind after the cleaner is sprayed and that is necessary in some applications. The one I purchased is the non-residue formula. I use it mainly for controls and switches when they get dirty. I have the residue formula just in case but I rarely used it. I used to get mine from an electronics store that went out of business after 60 years.(Baynesville Electronics)I am so glad I found it here. Thanks again, Amazon!

The chemical seems to work great, but the delivery straw IS too large (at least on my product). It will not fit inside the nozzle. I have to use straws from by WD-40 or Super Lube cans whenever I want to use the MG product. That is a disappointing experience from a company with such a good reputation.

Have a 50W tube amp (Friedman Runt) and lost bass response on 'dirty' channel. Reached out to Friedman and they suggested liberally cleaning the pots out with this (and only this) product. Was very leery at first but pulled my chassis from the cabinet and blasted the pots at mid pressure via the openings for the lead-outs. It worked like a charm. These Alpha-brand pots are pure tin coated and have an issue with strange symptoms popping up, Dave Friedman knew the fix, shared it, and we are rocking out once more on the over-drive channel!

For several years, I have used Kontak electrical cleaner when performing initial and periodic cleaning of equipment posts and RCA/XLR connectors. Due to the expense and difficulty of finding Kontak, I resorted to ordering MG 409B and am very pleased with the application result. This product is strictly a residue-free cleaner, without any silicone or lubricant additives -- just like Kontak. I prefer the convenience and control of bottling the MG 408B over the aerosol spray. Accordingly, I have filled the empty glass Kontak cleaner bottle and use Q-tips, pipe cleaners, small bristled brushes, and sterile cotton cosmetic pads to clean and wipe audio connectors and equipment posts. The cost/benefit ratio (compared to Kontak) is enormous, and the detailed specifications for both products are highly comparable. The MG 408B contact cleaner receives my highest recommendation for the stated uses.

MG chemicals are priced better than many of their competitors, yet the quality is always there. This is good stuff for volume controls and other pots as well as some switches.

Just the thing for cleaning corroded switch contacts and noisy potentiometers. A little goes a long way.

I'm delighted with this contact cleaner! I purchased it to help clean up my very "scratchy" 1985-vintage NAD amplifier. The amp would occasionally drop a channel and had very noisy volume and balance knobs. After blasting the cleaner and vigorously "working" all switches and pots, the amp sounds as good as new. I had the same great results for three small transistor radios! I was also able to get my oven's meat thermo-sensor function working by spraying into the temperature probe's receptacle and repeatedly inserting the plug. $20 bucks invested in this product has saved me hundreds!

Ça fait la job comme on dit, un peu cher à l'achat, mais bon pour longtemps

There was no instruction on how to connect the straw to the mouth, but I managed to make it work. I bought this product for the only purpose of fixing the drift issue with my switch's right joycon and that's exactly what it did. It has not occurred again and with that I am satisfied.

I got a Panasonic RC-X10 clock radio - similar to the one in the photo - which I purchased back in 1989. I really cherished this radio for many years, but a few years ago it starts to produce a bad scratching noise when I changed the volume up or down. I opened the radio and after vacuum it the best I could I used my air compressor to get rid of all the dust left behind. Then I applied this product everywhere inside the radio, including the volume control mechanism. After that I used the air compressor again, to dry everything up, I plugged it in and bingo, the scratch noise was gone. The radio is performing as well as the first time I used it and I believe it will last another 29 years.