sounds like you may have taken out the bearings. The only way I know of to remove any appreciable amount of sludge is to physically remove it. Using MMO, seafoam, diesel fuel, etc. only loosens the large chunks and makes them plug the pickup.
I learned that lesson early and now simply buy a gasket set and physically clean any engine I use. Sometimes I get lucky and only need to lightly clean, other times I am buying a new pickup, oil pump, and spending hours cleaning.
