I want to return to the question of the beginning:
"Has anyone experienced taking Castor Oil and then having a series of soapsuds enemas?"
Obviously this special form of a procedure for a complete bowel cleansing will be recommended:
(01) https://pubs.rsna.org/doi/10.1148/91.5.948
(02) https://www.ajronline.org/doi/pdfplus/10.2214/ajr.139.5.855
(03) https://books.google.de/books?id=ScPvM03B3lUC&pg=PA218&lpg=PA218&dq=enema+after+castor+oil&source=bl&ots=tKU_sAb0sk&sig=ACfU3U3sPhef9trxkrFxNdcTPEW4ncKFdw&hl=de&sa=X&
(04) https://merrilynhope.com/ideas-for-using-castor-oil/
"Within five hours of taking the castor oil laxative, you must have an enema, or a colonic irrigation."
(05) ved=2ahUKEwjAqNbX0eT5AhXV8LsIHQAzACE4ggEQ6AF6BAgbEAM#v=onepage&q=enema%20after%20castor%20oil&f=false
"Castor oil plus soap enema had the most marked effect, but most of the increased activity was due to castor oil."