Just to share my method. Once I was on a holiday trip and the filter got stuck, real bad. The filter will not come off no matter how hard I tried, using bare hands, gloves, rubber mats,cloth etc. Was exhausted after trying for nearly half an hour and felt like crying
) After some thinking, about the power of levers, I tried the following steps. The stuck filter came off in an instant!
Mount the lens on the camera (this ensure the lens cannot move)
Sit down on a chair. Hold the camera between the legs, lens pointing up.
Grip the camera firmly between the thighs so the camera has little or no room to move.
Use the palm of the right hand face down to cover the filter, feel and squeeze the rim of the filter.
Adjust the contact between the filter and palm till you fell you have a good grip all round and the pressure is spread evenly.
Place the left hand palm down over the right hand to grip it so as to provide additional leverage
Feel where the the pressure is applied on the filter to ensure its evenly spread out
Grip the filter tight, PRESS DOWN ON IT, and turn both hands in an anti clockwise direction with a twisting motion.Try with arms/elbows close to the body, like they are locked in, so that the body twist gives added strength to the turn.
The pivot point is where the lens is locked into the camera, do it like you are trying to turn the lens in the locking direction using the grip on the filter.
The position, immobility, pressure and action somehow act like a lever to give maximum torque or force to twist the filter. Viola,the filter turned and can be removed. A hopeless situation was saved...... Can try to see if this work for you. Cheers!