Likely we all have different types of road dirt because we ride in vastly different circumstances....but I find that by far the worst part of my bike dirt is the NASTY black stuff that develops on the gears and chain, both front and back. We don't have bike trails or clean roads here, ...all my riding is either on irregular asphalt high traffic roads along with the cars and trucks, or on back country dirt roads.
I found if I started out by soaping up my whole bike with a soapy sponge and hot water, the sponge gets some of that greasy black crud on it and just smears it on the other parts of the bike (plus it ruins the sponge for all time).
So my sequence is to use the strong citrus degreaser on the gear rings, cassette, and chain FIRST to get the black crud gone. Plus, I feel the citrus can do a better job of degreasing a DRY chain rather than one filled with water.
I know the citrus is not good to leave on the frame paint for more than a few minutes, so I saturate the chain first with citrus, scrub the front rings with a brush, then rinse the front rings, then do the back cassette with a long bristled brush I save just for that purpose, give the chain some more scrubbing with citrus, then rinse it all well.
Following that I get my hot soapy water and big sponge and start going over the whole bike- no black crud to worry about smearing around, plus the soapy water then removes any trace of citrus degreaser (which is basically strong orange oil) from where it may have splattered on my frame while scrubbing gears.
I wait for the whole bike and chain to dry before lubing the chain. Then i wipe the chain thoroughly with paper towels after lubing, so it won't have an outer film of lube that dust and grit from the road can stick to. Lube should be inside the chain links, not on the outside of the chain.



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