Hello- this mix is interesting, but far too mild for oil based paints, and modern acrylic/ alkyds. No-one mentioned the new version of the old-fashioned way, hot air guns are cheap, the better ones are adjustable, and they don't need the high level of skill and safety required by blow torches (It's quite hard to set fire to the peeling paint or the wood below with a gun, but almost inevitable with a torch). They are great for peeling off plastic tiles, softening plastic pipe, and helping BBQs along when you are done with paint scaping..... the only time I've ever seen a problem is when someone didn't shield window glass when stripping the frames!
There's no harmful chemicals, and far fewer fumes from the softening paint.
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Caustic soda (aka lye) is used for industrial stripping sometimes, so you've got an option there with other answers. Dichloromethane/methanol is a commercial mix, but it's nasty and you'll not get it together. Olde-fashioned method is blowlamp (until soft) then scrape. L
Washing soda is likely to be too mild to soften oil based paints - Paint strippers tend to use solvents or caustic soda - not very nice on you skin etc. Safety precautions essential.
Mix washing soda (available in the laundry detergent section in most supermarkets) in warm water until no more will dissolve, then slowly add flour, a spoonful at a time, to thicken the mixture into a brushable paste. Brush onto to the painted surface, let sit for 30 minutes, then scrub with a stiff bristle brush while rinsing the mixture off with water.
Nice. Is that only for water-based (latex) paints, or does it work with oil-based paints as well?
I've only used it on latex paints but when I learned of the recipe, it was claimed it worked on all paints, but I can't attest to that.