Window cleaner and twisting the ring will get your ring off your swollen or bigger sized finger. Absolutely brilliant - sharing this with the world. :-) Found the tip on http://www.tipking.co.uk/tip/2875.html
It helped by putting my finger over my head every so often, used like 10 or so squirts, it took a few minutes, my finger was red and a bit sore afterwards. It is the only thing that I have found to work. :-)
