Clean what moves, ignore the rest.
Special attention to chain and drivetrain with a stiff brush and blast out with the hose, and brakes - soak all over the callipers with muc off and blast out with the hose. Get ALL muck away from suspension rotating and sliding parts.
Various post wash potions include WD40, clear grease round suspension pivots, light oil round suspension seals (wipe off before riding). I'm not getting into the chain lube debate.
Bear in mind that in singletrack forum universe, turning the bike upside down un-bleeds the brakes and "anyone else's preferred detergent" is made of acid that dissolves metal (especially hardened bearings) in seconds.