I've held back on posting about this because it is kind of embarrassing and probably my fault but I'm so sick of ruining collars. My leather (diva stars) collar has begun to smell terrible, I assume this is because of neck sweat, somehow I got it wet? it smells mildewy. I've scrubbed it with an old toothbrush using soap, then rubbing alcohol, then nothing over and over but it still smells. Anyone have any advice for cleaning leather? I know there are leather cleaners but I don't want to spend money on something without a glowing recommendation.