I've noticed that when gel air fresheners dry out there is still a fair amount of aroma in the now solidified block if you smell it close up. I assume that they work by carrying that aroma when the liquid in the gel evapourates. I tried adding warm water to a dried out one and whilst the water took on the colour, the block itself didn't seem to soften. Is there a way to reactivate a dried up air-freshener block?
Please note, this is a very specific question and I am not asking for alternative ways to make a room smell nice, like making pot pourri etc.