Reddit mentions of Nike Unisex Replacement Shoe Laces (39, Athletic Black)

This is my general recommendation for Romaleos:

Take the laces out, remove the insoles, put the shoes and insoles in a mesh bag and put that in the wash (normal detergent, low temperature, long duration, delicate/slow spin cycle, extra rinse if available). Add white vinegar to the wash if they're dirty (or in your case have permanent marker). Air dry when finished.

For areas that are still dirty—usually the toebox, stitching, and any tight areas, use a diluted all purpose cleaner, a rag, and a nylon brush (toothbrush would work as well). You can wait till they're dry or do this anytime after they're out of the wash. I use Meguiar's APC diluted 1:10, but I assume something like simple green would work just as well although I can't speak to their effectiveness and dilution ratio. I also like to use plastic/rubber/vinyl dressing (like CarPro Perl) but I don't expect anyone to have that on hand or to buy it.

That should take care of most issues but if you have any other weird shit stuck on your shoes I can always recommend other removers.

If you're laces are in bad shape (and they likely are) buy new laces. 39" laces are slightly shorter than standard but end up fitting nicer (in most cases), but feel free to size up.

Reassemble.