It's called encopresis, op.
And you were extremely rude to 3littlefrogs, who was merely pointing out that it is a medical issue, and not one that can be star-charted and reward base programmed out of existence.
The bowel can take up to six months to repair the nerve pathways until the child can feel the need to go to the toilet, even after the impaction and overflow is dealt with.
And she was being very clear, because even though encopresis is very common, it's also one of those things no one talks about, and tries to treat as a behavioural issue with star charts and such.
You should use your advanced search facility - there have been many mn threads on the subject.
As he is 6 and still having wet accidents during the day, you should ask your GP for referral to enuresis clinic. For night time enuresis they don't usually bother until 7, but day time wetting in a school aged child will get you in, depending on protocol in your area.
Ds1 was treated with a series of suppositories, plus what passes for movicol here. If this is the case, it does take a long time to resolve, and you can't remove the movicol dosage too sign - it has to be gradually reduced or you will be right back to square one again.