What is this thing on the pcb of the mini remote?

See, that’s the worst part… its “no clean” flux rofl! That’s what i do, grab some lint free cloth saturate it with isopropyl 99% and use the soldering iron to push it around.

That’s what they mean by “no clean”. They just have bad grammer.

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YES IT’S NO CLEAN… but you need the process behind… like a oven… temperature curve… and industrial processus… It’s not really meant for using with only a soldering Iron or heat station…

also it is no clean because the flux dielectric is so high that you technically don’t need to remove it.

If you want easy to clean flux… take water soluble flux.