[Landseer]

I use cheap bottle brushes from Northern Tool (wire bristles) and clean all those surfaces and crannies dry, with shop vac suction at the same time. I build a neck-down nozzle that ends with a piece of 5/8 or 3/4 radiator hose.

Then, I do similar work again with rags and shop vac, using WD 40. Downside is greasing up the shopvac hose, but its worth it. As I remove parts I am sure to stuff rags in to prevent any remaining sand and junk to get in. Its very hard to remove all the junk without some disassembly and cleaning on the fly. For me, WD has the right amount of solvent action with low volatility. I buy a hand pump sprayer and gallon can WD.

For the lower/underside I might use some brake cleaner, some WD, but the best is multiple applications of Gain 50/50 with water in a pressurized bug sprayer and soak and rinse.