Any tips on this? I have kids gobbing and breathing all over my 58 day in, day out. What to do?
The perception of health risk far outweighs the reality, but it's not nice to have to use a smelly mic, and worse if the previous user spat the undigested remains of his chinese takeaway stuck in his teeth into the thing!
The grille head on the SM58 can be unscrewed for cleaning, when absolutely necessary but beware that there is a thin piece of foam in their which shouldn't be damaged -- it's important for minimising plosive popping.
A quick wipe over with an antiseptic wipe should be more than sufficient for general use. Sometimes making a show of 'sanitising' the mic is enough to put people at their ease, regardless of the actual medical benefits. But if the grille does start to clog with oral debris, then carefully remove the foam liner, and give it a full on rinse in warm soapy water(I've even had to use a pin to pick out debris before now!). Just make sure that you dry it thoroughly before refitting, and clean the foam delicately before re-installing.
Also, protect the mic's capsule with a poly bag when you remove the grille.
Technical Editor, Sound On Sound