Is it just me, or does anyone else's Magic-Alls smell?

There are a few of my MCNs that are quite stinky, but I think these are the worst..I don't think it's the detergent build up thing..and I pretty well always dry them in the sun....

Could I add some drops of EO in the wash to help do you think?? Or is it just something that I should put up with??

Any hints would be so appreciated..