There's one other point I would make and that is to never use sewing machine oil the way it is used in the video. The result of using sewing machine oil to clean the bobbin area as was shown, will be to over oil the entire area and make it a dust and lint magnet.
Use one or two drops of oil in all the oiling points and no more.
Brushing sewing machine oil all over the bobbin area of a machine is not the way to clean it. Singer recommended kerosene when a machine was gummed up because kerosene will dissolve old oil and then it evaporates. You can also use 99% alcohol which will do the same thing. Don't use 70% as that is 30% water which may rust a machine.