This quick fix will work for most clogs however if your clog is severe enough then this might not cut it. With that being said the way that this fix works is you raise the nozzle temp to 20°c above the filaments printing temp and then once heated, extrude the fliament and the clog should clear. For example if your printing PLA, the print temp is 200°c so to clear the clog you would need to make the nozzle 220°c. For temperature information on more filaments look at the chart.