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6 Tips to Properly Use A High Pressure Washer

Whether you’re engaged in some DIY pressure cleaning, hiring a professional, cleaning large areas or small areas, we’ll outline 6 tips to properly use this powerful cleaning tool. Helping you create spotless surfaces around your property.

1. Put in place these safety measures

You should always keep in mind that a high pressure washer is an incredibly strong piece of equipment. If not used appropriately, it has the potential to break windows, strip paint or even create holes in bricks.

High pressure washers can also cause physical injury and even death. One man in New South Wales lost balance when using a washer and was killed when the water struck his chest inflicting fatal organ injuries.

It’s therefore always sensible to perform the following safety tasks:

  • Read the safety manual (no matter how dull it may seem). It’ll tell you everything you need to know about operating the equipment and how to troubleshoot the product.
  • Wear protective clothing. Don’t wear thongs or boardies. You’re going to have to protect yourself with full-fledged safety goggles, gloves and steel-capped boots (if you have them
  • Don’t use a ladder. Ladders are bad news when it comes to pressure washers. Inertia  can blast you back – potentially with a dangerous consequence if you’re standing on a ladder.
  • Organise your surroundings. Close the doors and windows. Remove all slip and trip hazards. Sweep excess debris off the surface if possible. Make sure your kids and pets are kept well away.

2. Choose the right spray nozzle

Depending on the pressure washer you use, some come with a single variable nozzle you can adjust between zero to sixty degrees.

Many come with coloured nozzles too, which are coded to their particular power pressure – and you’ll change the nozzles as you go from job to job.

  • Black – this is the lowest pressure and is reserved for applying detergents.
  • White (40°) – a gentle spray, reserved for more fragile surfaces like windows. Useful for pressure washing car windows and arguably the best for cleaning the outside of your home.
  • Green (25°) – a strong pressure but common for use at home. Effective for driveways, outdoor furniture, decks and cars.
  • Yellow (15°) – more forceful water pressure which you’d use to remove mildew, paint or dirt. It can also be useful for tougher grime on strong surfaces.
  •  Red (0°) – this is the toughest pressure. It’s unlikely you’ll ever need to use this – for removing the toughest stains from small areas on metal or concrete. You should never use red for wood.

3. Prepare a washing schedule

Don’t just use a high pressure washer without a plan. Establishing a schedule will help you reduce your waste of detergent, petrol and water (all of which must be used to run your washer).

You should wash:

  • Your vinyl siding every two years.
  • Your wooden decks once every year.
  • Your concrete driveways once every year.
  • Your stone and brick alfresco areas and footpaths every three years.

4. Start cleaning with a wide angle before adjusting

If you’re pressure washing a particular surface for the first time, this tip is particularly important.

Begin the wash by holding the spray around 60 to 90 centimetres away from the surface. If that does the job, no need to make any changes.

If it doesn’t clean it, move the spray closer but never go closer than about 15 centimetres. At that distance, if it’s still not clean, use a nuzzle with a stronger force.

5. Follow these steps when pressure washing your car

A high pressure cleaner can be effective way to thoroughly wash your car. But it’s important not to use an overly powerful washer, as you’ll run the risk of stripping the paint or breaking the windows.

  • A washer between 1,200 and 1,900 PSI such as the BAR Hot Pressure Cleaner SMART is most appropriate.
  • Begin washing your car with plain water and only a low-pressure nozzle (such as the green 25° nozzle).
  • Scrub your car exterior with a brush, before rinsing from the top down. Don’t spray inside your car’s engine bay.

6. Take care when washing vinyl siding

When using a high pressure washer to clean the vinyl siding, it’s also best to use a lower pressure or, if you’re applying soap and detergent, the black nozzle.

  • Apply soap from the bottom to the top in order to prevent debris from seeping down dry areas and creating dirty streaks.
  • It’s important not to let the detergent dry, but you should leave it on your siding surface for a few minutes. Don’t wash when the surface is directly in the sunlight.
  • Once done, use a higher nozzle (somewhere between 25° – 40°) and hold the washer about 45 centimetres away from the siding (bottom up) before rinsing from top down.

Using a high pressure washer can be a tremendously effective way to clean various surfaces, but you should always make sure you use the equipment correctly. Contact the experts at Melbourne Jetter Centre with your questions today.

Quick Questions

Why is my pressure washer not building pressure?

Check the nozzle first, then inspect the water supply, pump oil and unloader valve. Clogged or worn parts are usually to blame.

Why is the pump leaking water?

Seals or O-rings have probably worn out. Replace them before the leak gets worse and damages the pump internals.

Can I fix it myself?

If it’s basic, yes. You’ll need some tools, patience, and the right parts. For bigger problems or cracked housings, call a pro.

What’s the most common pressure washer pump issue?

Low pressure wins by a mile, often from something simple like a dirty nozzle, restricted water flow or a clogged filter. It’s easy to fix if you know what to look for.

When should I replace the pump?

If the repairs cost as much as a new one, or it has cracks or bad internal damage, replace it. We’ll help you pick the right one.

Why is it pulsing or surging?

It is usually caused by a blocked nozzle, air leaks or worn pump valves. Clean, tighten and inspect the parts before running it again.

Why is my pressure washer not building pressure?

It is most likely a clogged nozzle, air in the system, or a worn-out unloader valve. Start by cleaning the nozzle and checking your water flow. If that doesn’t solve the problem, inspect the pump and unloader.

Why is my pressure washer leaking water from the pump?

Usually, it’s worn seals, cracked pump casing, or loose fittings. Check for visible drips while the unit is off and replace any seals or damaged parts. If it’s leaking from behind the pump, the oil seals might be the culprit.

Can I fix a pressure washer pump myself?

Yes, if it’s a minor issue, like replacing O-rings, unblocking a nozzle, or swapping a valve. But for internal pump problems, like damaged pistons or crankshafts, it’s often cheaper and faster to take the pump to a pro.

How often should I check or change the pump oil?

Check the oil every 20 hours of use or before each big job. Change it every 50–100 hours, depending on the type of pump. Always use pump-specific oil (not motor oil).

When should I replace the pump instead of repairing it?

If the cost of parts and labour is close to the price of a new pump, or if there’s cracking in the pump housing, replacement is the better call. We can assess it for you and give you an honest recommendation.

Why does my pump keep overheating?

It’s likely running dry, has poor ventilation, or is using the wrong type of oil. Before starting the machine, make sure water is always flowing, clean the air vents, and keep the oil fresh and topped up.

Talk to us at Melbourne Jetter Centre