I'm a big fan of this..........."The Detailer" Ready To Use Washes. I buy it on eBay.
After applying a gloss clear coat (protect any decals first with a clear coat) I apply it with a brush and after it's dry I use a damp Microbrush to remove it from the areas where I don't wan't it. Wiping it towards the recess or detail where I want it to remain.
It sometimes takes about three passes with the damp Microbrush (dabbing it on a paper towel to remove it from the Microbrush and re-wetting it) to wipe the undetailed areas clear and brighter. I'll wipe these areas in a downward direction to push the water and wash towards the deck-bulkhead interface.
Bridge window areas sometime require two applications in order to make the centers of them, dark.
This product can look a little like Gunmetal paint instead of Black but a clear coat gets rid of this effect. This wash can also make the overall paint look a shade darker but, now I am counting on this effect. A clear coat keeps the wash from darkening the finish, too much.
Here is my USS Virignia model with the wash applied.
And here is my USS Scott (life raft cannisters aren't done yet) with the wash just the way that I want it.