I'm sure there are other similar products on the market but I love Bourjois Dissolvant.
The only time I felt like I had to put a bit more effort into the removal was when I was wearing glittery nail polish. I soaked my finger in the pot a little longer but it still came off!
I wouldn't recommend sniffing nail polish remover but this one does smell very nice and feels really conditioning on the nails.
Available from http://www.boots.com for £4.99