Arrived. descaled all hot wells. rinsed and flushed after words. descaled dishwasher. ran unit while descaled was in unit. drained and flushed out. OK for use. also delimed steamer. very minimal scale was found In generator. after descaling generator was clean. flushed unit and wiped out cavities. OK for use. will return to check over rationals. 1/29/20 Returned. visually inspected generators on rational ovens. all are clean. no need to delime. okay for use.