general rules in the use of cleaning equipment?

Answer 1

Never run the upright vacuum up to the edge of your daughter's long hair while she's lying on the floor.

Do not accidentally grab a large pile of clean, rather than dirty, laundry to soak up the water if the washer overflows.

Do not shake the feather duster in the house to clean it.

Make sure the opening is pointing away from your face when using spray cleaners.

When using a rotary floor scrubber, never let go of the handle while the machine is on.

Before attempting to clean a commercial deep fryer, be certain the oil is cool.

Never clean an electric slicer with the blade turning.

These are just a few I've learned from experience. If you want a different answer, you'll have to ask a clearer question.