I just wanted to make sure I'm doing everything right for the dragon stones I just got. I have rinsed them and brushed them several times, used a skewer to clean out as much clay as I can from the holes. I plan to pour boiling water on them in a bucket tomorrow and then brush and rinse once more, right now they are soaking overnight. Would this be sufficient cleaning for my stones? If I still see some red coloration coming off after brushing them should I continue until they rinse clean?