<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">I use Electrolube SWAJ which works as Roman says. I bought a heated ultrasonic cleaner, but this stuff works superbly when I just put the boards in it for a couple of minutes then rinse it off, so the cleaner never gets used.<div><br></div><div><br></div><div>Phil.<br><div><br><blockquote type="cite"><div>On 28. Sep 2023, at 15:46, Roman Sowa <modular@go2.pl> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">Electrolube SWAS.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">Water based, smells nice (if you like that kind of smell) and does marvelous job. It can be dirty as hen house floor and still does its magic. Unlike IPA, which only takes one drop of dirt in 5L tank to make it unuseable.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">I change mine only every couple of years.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">Roman</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">W dniu 2023-09-28 o 10:00, Andrei Kudryavtsev via Synth-diy pisze:</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><blockquote type="cite" style="font-family: Helvetica; font-size: 18px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Hi All,<br>I have PCBs with SMD and TH parts, and also with plastic connectors. SMD parts are machine soldered, TH components are manually installed. Obviously some flux residue is visible from manual soldering.<br>I have a 22L ultrasonic cleaner with a temperature control.<br>The boards are quite large, like 100x250mm or so.<br>Wondering if you can share some experience using an ultrasonic cleaner to avoid solvent based sprays and mechanical cleaning.<br>There are some threads of using IPA inside small zip lock bags to avoid evaporation, which seems to work well for small boards and is relatively safe. However it's not my option due to the board size.<br>I also see some "ultrasonic flux remover" detergents on eBay, but for some reason they are all in the UK.<br>Also I found the specialized Flux Off by Chemtronics but have never tried it.<br>Please, suggest.<br>--<span class="Apple-converted-space"> </span><br>Andrei Kudryavtsev,<br>My last album *Two Match - The 1st Fill* on iTunes <<a href="http://itunes.apple.com/us/album/the-1st-fill/id1241529125">http://itunes.apple.com/us/album/the-1st-fill/id1241529125</a>>and Spotify <<a href="https://open.spotify.com/album/4aM8DzmN5yi4ho1gcmC8ls">https://open.spotify.com/album/4aM8DzmN5yi4ho1gcmC8ls</a>><br>Follow me on Facebook <<a href="https://www.facebook.com/andrei.kudryavtsev.5">https://www.facebook.com/andrei.kudryavtsev.5</a>>, Instagram <<a href="https://www.instagram.com/deftaudio/">https://www.instagram.com/deftaudio/</a>><br>Music technologies by<br>Deftaudio<span class="Apple-converted-space"> </span><a href="http://www.tindie.com/stores/Deftaudio">www.tindie.com/stores/Deftaudio</a><span class="Apple-converted-space"> </span><<a href="http://www.tindie.com/stores/Deftaudio">http://www.tindie.com/stores/Deftaudio</a>><br>_______________________________________________<br>Synth-diy mailing list<br><a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br><a href="http://synth-diy.org/mailman/listinfo/synth-diy">http://synth-diy.org/mailman/listinfo/synth-diy</a><br>Selling or trading? 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