Don't hose it down unless you also enjoy rebuilding/regreasing the bearings

If you have somewhere dry to put it (shed/garage) just brush off the dried dirt/mud in the morning. Especially dirt underneath the bottom bracket where the rear cables go under the frame and around the axles / pedals.

Once a week I clean the chain and re-oil it (you might have to do this more often depending on how many miles / how bad the weather is) I also check and oil the brake/gear cables and brake pivots etc.

Run your finger over the spokes to just check if any are loose, at least once/week - daily if you have rough off road sections.