Guess i should clarify I don't bathe the bike in WD40.....just enough on a rag to get any road grime, oil etc removed.

The WD40 therefore does not remain in a wet finish......never had issues with dust after.
Also; if i am really in the mood i finish off with Mothers Carnuba Wax, as used on my car.

One could go to town and buy the BIKE SPECIFIC products; but it really does pay to do research on anything you want to do nowadays.......and save yourself a lot of money; marketing will make you buy anything; but with the internet there is no excuse to educate yourself.