Mine are aerius ii, there in an aerius i ( or is it just plain aerius?) and sidetrims are remived by tapping downwards.
This seems to contrary to other ml models so the above advice is good.
It doesnt take a lot of force, i reckon it could be done by hsnd although i never tries that.
Read up about ckeaning, you can use a vacuum cleaner tk suck out the dust with the metal mesh screens in place or give them a wash in the shower, advice to that is on here.