Cleaning the bobbin area
I take the needle plate off, and disassemble the drop in bobbin area. I poke my tiny brush into any and all crevasses I can find and clean the feed dogs. It probably takes me 10 minutes. I am always shamed when someone says they clean the bobbin area with every bobbin change. I am just impatient to get back sewing (or maybe lazy!). It takes so long, so I do this every 2nd bobbin change, and just brush out the case & hook area on the alternate changes.
Recently I have found that several of my fellow quilters consider my quick brush out version 'cleaning the bobbin area'. They seldom take the plate off, like maybe at the end of a project or if they break a needle.
Just curious how you define 'cleaning the bobbin area' and how often you do it.