The useful P1S maintenance schedule is based on condition and print hours, not a ritual after every model.
Before a print, clear purge waste, check the plate for residue and look for filament wrapped around the nozzle. With the machine cool, remove loose debris from the chamber. Do not use compressed air to drive dust into fans and electronics.
Wash a greasy plate with warm water and plain dish soap, then handle it by the edges. Use IPA only where the plate maker permits it. Different Bambu surfaces have different adhesive and cleaning rules, so keep their instructions with the plate.
Inspect PTFE tubes for deep grooves, flat spots and tight bends. Check that the toolhead cover is secure and that belts show no damage. Carbon rods require the cleaning method specified by Bambu and must not be treated like ordinary steel guide rods. Apply lubricant only to the components and intervals in the current P1-series maintenance guide.
Fans should turn freely and remain clear of strands. A new rattle, repeated homing impact or temperature error deserves diagnosis before another long print. Do not open the power supply or heater wiring as routine maintenance.
Keep a simple log with print hours, nozzle changes and lubrication dates. It is more useful than guessing whether a squeak began last week or six months ago.
When routine cleaning is not enough and the nozzle itself seems blocked, follow the dedicated clogged nozzle guide for the safe clearing sequence. If a full hotend swap becomes necessary, or the printer starts raising alerts during these checks, the P1S HMS error index is the place to decode what the machine is reporting.