Do you have weeds you can't pull or dig?

I'm not sure what impact, if any, dish soap and Epsom salts would have on killing weeds. Epsom salts is magnesium sulphate and is actually used as a plant supplement. Vinegar can be effective but only when applied when the plant is in full growth and with sun. Table vinegar is pretty dilute compared to horticultural vinegar and usually needs multiple applications. And it can damage any plant it comes into contact with.

The best home made weed killer is your two hands and a sharp pointed digging tool :-)