Initally I have the UV filter fixed onto my 24-105 L lens. Then I added in the polarised filter but was unable to unscrew. So I have my polarised filter stuck to my UV filter but they can be removed my lens.
Usually when my filters get stuck. Wat I do is I unscrew them w a very minimal force applied. I juz hold lightly on e filters n unscrew - meanin I avoid pressin too hard against e outer race of e filter inwards.
never happened to me before... but you could try putting a rubber band on the circumference of the filter and unscrewing it. The rubber band gives you a bit more grip. Works on bottles. might work on filters...
sigh..it doesn't work.. do u think I can send it back to supplier to rectify it? anyway worst case, I may have to buy another UV. but is it ok to use the polarised + uv together? I am using a 24-105 L lens + Canon 30D
Try going to a department store, houseware/kitchenware dept and buy one (or maybe two in your case) jar opener. It is a handheld device to open jar lids. Make sure you buy one which opens wide enough for your filter diameter. You may require two to grip both filters and unscrew them.