I thought the reason why people weren't getting the foam out was because the expansion of the pressurized propellant in the cans would get cold when expanding causing their pressure to diminish and then you don't get it all out. If you heat the cans by immersing them in water you can fight the expansion cooling and get more out.
If that isn't why people aren't getting it all out, then what is keeping them from mostly emptying the tanks? There are thread post upon thread post of people saying they didn't get the full amount out.
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