Did you know you should be cleaning out the back of your hair dryer?
I think the answer for most people is probably not! I know myself I often forget to do this.
To clean out your hair dryer find the cap at the back where it takes in hair & twist it off.
Inside you will most likely find a filter that's filled with dust, dirt & all sorts of gunk. Kinda like the lint you find in your dryer.
Use a tooth brush or damp cloth to wipe it all off & clean it out. If it's past the point of no return hopefully you have a replacement... with most higher end hairdryer they include replacement filters in case you let it go too far.