Recently the hose on the CT 22 in my workshop has started whisteling. This is very annoying and I assume it's caused by a wood chip or sliver being stuck inside the hose. Oddly enough however the nosel seems to have the ability to stop it. If left alone it whistles but when I pull the nosel in it stops. I assume that by doing this I stop the turbulence going onto the chip or something or it is being cause by the nosel, which would be even worse. Does anyone know how to clean out the hose? Has anyone else had this issue before? It is a 27mm hose.