disimpaction for children

What is the best way to clean a colon in a 5 1/2 years old child? We have been following a medical cleaning program wchich is a combination of enemas, oral laxatives, suppositories and high doses of mineral oil for about a week now without much success. The x-rays show impaction throughout the colon which is also streched. The next step is a hospitalization and Ng tube procedure. Is there anything we can do before that? Diet is mostly fruits and vegetables. Now we are trying to increase fluids
Thank you