I don't know about bleach on your spinach seeds, but you might give the ones you have up a drench with some hydrogen peroxide and water, heavier on the hydrogen peroxide.
If you soak the new seed, I would still soak in hydrogen peroxide with some water and rinse a couple of times before sowing and I always moisten my soil when I plant seeds with some of the same mixture.
Usually spinach germinates fairly quickly. I wonder if you even need to soak them. Could be the grey yuck is from the seed coat getting to wet and starting to rot.
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