Mr Crudley
Glock in your sock
Yo can't stop dust and that is part of the fun of MTB'ing anyhow. I see more dust on the front of my fork stanchions too.About 9 months, don't think it is as good with fine dust as it is with mud and other debris, but still reckon it keeps some of it away. I notice more dust on the front of the stanchions rather than on the rear now, must be what is thrown off the tyre after it has gone past the guard and then blown back on.
The mudguards probably do more good than we give them credit.