You have two choices, bandaid or fix. First choice bandaid, install a shut off in fuel line, drain the oil to remove contaminated oil. Put in fresh oil. You must always remember to shut the fuel off when not in use or you will need to do this again. Second choice fix, remover carb and have it cleaned and rebuilt. Drain oil and put in fresh oil. You should now have the problem solved and don’t have to worry about it. My recommendation, fix it and not worry it I forget to shut it off.