You can also apply the vinegar to toilet paper and stick it on spots overnight. This will help to ensure maximum exposure to the acidic vinegar.
You may also want to use a smaller head brush to get into tight spots around the rim of the toilet. A kitchen dish brush works well for this, but do not use it to wash dishes after cleaning your toilet with it.
Be careful not to mix these solutions with bleach. The mixture can create a dangerous poisonous gas. Many in-tank cleaners use bleach. If you have an in-tank cleaner, remove it and flush several times to rid the toilet of any bleach residue.
