Thanks for sharing! All I can say is SHAME on JENNY! lol Well...she did say SPRING cleaning!
I never let my machines get that way. I clean them every time I change the bobbin. I keep canned air handy and just blow out through all the openings and above the needle area. Works like a charm. IMHO, with prices the way they are these days our machines are an investment and need to be treated as such.
I keep a separate needle for paper piercing pattern copies, but don't change my needle unless I have an issue with it, such as bent, broken or just not piercing the fabric properly.