How to remove high pressure water marks from decking?

[samiullah001]

Hi,

Can you please advise how to remove the High Pressure Water marks from the decking?
I applied decking oil to cover it but it didn't work.

[EricL]

Hello @samiullah001 

Welcome to the Bunnings Workshop community. It's wonderful to have you join us, and thank you for sharing your question about removing gurni marks on your decking. 

The high-pressure water from the pressure washer has pushed the oil, dirt and debris away from the surface of the deck. If you give it a few weeks those clean spots will eventually fade and blend in with your deck.

However, this also presents you with the opportunity of cleaning your deck with the pressure washer. I suggest having a look at the Cabot's 1L Deck Clean. It will wash away accumulated dirt, debris and grease on the surface of the timber deck.

Here is a handy step-by-step guide: How to clean a deck.

If you have any other questions we can help with, please let us know.

Eric

[samiullah001]

Thanks - I did apply the Cabot's Deck Clean but it didn't help. May be I need to wait for few weeks to blend it and then clean it.
Do you think sanding the deck would help or it will create more issues?

[EricL]

Hello @samiullah001 

Just for clarification did you use a pressure washer again when you used the Cabot's 1L Deck Clean or did you just use your garden hose to wash it down? Technically it should have cleaned off the top of your decking boards and reduced the marks of the pressure washer on your deck.

However, if it has had little effect, I suggest using a pressure washer on your entire deck in combination with the Cabot's 1L Deck Clean and an Oates Long Handle Deck Scrub Brush. It is necessary to use a proper decking brush so that the dirt and debris on the surface get taken off, if the brush you are using is too soft it will not be effective.

If you decide to sand the deck back, it means that you will need to apply new decking oil on its surface. But if you are thinking of sanding only that damaged portion it will not work as you will get two uneven spots of new and old decking oil. It will be very visible and there would be no way to blend it in.

I also suggest having a look at this guide - How to stain and protect decking timber by @Adam_W.

Please remember to wear personal protection such as gloves and goggles when handling decking oil.

Here are some handy step-by-step guides:

• How to sand a deck
   
• How to oil your deck.

If you have any other questions we can help with, please let us know.

Eric