If my bike is too bad
and that includes mud under the mudguards
then I hose it down
then I have found that a leaf blower is pretty good for getting all the drops of water off it
they just blow off the same way those Dyson (other makes are available - some better) hand dryers in the loos work
especially good if I got back and am cold and wet and just want to get in and get dry and have a cuppa