Removing the bobbin race is the only way to be sure it is clean and will run smooth. I routinely take them out as I clean any machine with a drop in bobbin. When I’m sewing I often have to stop and take it out to clean. The 15 type bobbins come out to clean but a lot of times they don’t accumulate as fast as the drop in type.
They are very easy to take out. Getting them back in is another story. The fork goes around the little protrusion thingy.