Added vinegar to a moldy underglaze and now the texture is atrocious any suggestions?

my amaco intense yellow velvet underglaze has been prone to mold and I saw online to add some vinegar to get rid of it, but now the texture of my glaze is gritty. any suggestions or insight on why this happened and how to fix it? I still have such a large bottle I don't want to just throw it out (lord knows they're too expensive for that)