[William Sommerwerck]

I've got a better suggestion. I'd contact Caig and "urge" them to replace
the cans.

There's no reason the cans should lose their pressure. I have a can of
Prestone "Tuff Stuff" cleaner that's almost 40 years old and it still works.


The "loss of pressure" might not be that at all, but defective valves. I'd
be very cautious about puncturing these cans. Ask youself... How would Adam
and Jamie do it?