To clean the hydrojet pump, it will need to be flushed out with clean water. The easiest way to do this is to place the pump in a bucket of fresh water and draw the handle in and out of the pump, to draw in and flush out the internal cylinder with clean water.
Once the pump is flushed clean, or if it has been used in clean water, it can then be dried off with a cloth and stored away ready for when it is next needed.
Spare parts
Cup washers
Depending on the manufacturer, some may stock cup washers which can be purchased as replacements if the ones supplied are damaged or lost.