How to Remove Sap from a Deck

Here’s a question from our 08/17/2019 Today’s Homeowner Radio Show.

Laurel in South Dakota says, “I had a deck put on two years ago, the floor is 2-by-6 pine. It was treated with two coats of oil stain. This summer, it was starting to have [sap] leaking up from the wood in several places.

“Have tried both Murphy’s Oil Soap and mineral spirits. Both worked for a few days, but it comes right back and is very annoying. Do you have any solutions to this problem?”

We tell Laurel that if she wants to try Murphy’s Oil again, she should try and submerge the troubled areas. She can also use WD-40 or acetone but this method may damage the finish.

Of course, when the weather does freeze the sap, she could scrape it off with a putty knife.

Listen above for the segment!

Read the blog from the August 17 show and listen to the full broadcast here


  1. I have a 20 year old deck that one board just started leaking this year. We have had 5 days of 90 degrees weather and this must have pulled the sap up. I did have one post leak sap early on the deck’s beginning, but this board was not one that leaked before. Unfortunately, it is right by the sliding door and before I realized what was happening, it was tracked quite a bit onto my ceramic tile. Pain to clean off the tile!

    • That does sound like a mess, Glenn!
      Definitely try the tips in this segment and let us know how it goes. 🙂


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