Which Viking do you have? I know the Viking lline very well and all of them allow you to get the bobbin case out to clean in the area. Also do a search on-line there is a newish gadget that just found that is fantastic at cleaning out you machine. Now don't get weird about it but it is a pap smear brush. Yes you read correctly. It has a small bottle type brush at the end and has a very flexible handle and it can really get into the machine where we have never been able to go before.