Does vinegar neutralize potassium hydroxide

YES!!!!

Vinegar as a chemical is ethanoic (acetic) acid . wirth the formula of CH3COOH.

Potassium hydroxide has the formula ' KOH'The BALANCED reaction. eq'n is

CH3COOH + KOH = CH3COO^(-)K^(+) + H2O

so the products are potassium ethanoate(acetate) and water.