How do I get grease stains off our wooden deck?

Sherryl....Pressure wash and use Krud Kutter from Lowe's.

There are a TON of great degreasers out there. Our favorite, to start with is clay kitty litter. It will absorb a lot of oil. (works great on the driveway and garage floor, too). Then the simplest and most accessible thing is dish soap. Almost everyone's go-to is blue Dawn and a splash of vinegar, neither of which should bother the wood. Let that sit on the stain for a bit before you scrub. Depending on how bad the grease stains are, it might require a repeat.

Hi Sherryl!

Grease is such a painful thing for us all isn't it. Hopefully these suggestions will help you get rid of those stains on your wooden deck.

https://www.ehow.com/how_7588631_remove-grease-wood-deck.html

http://www.howtocleananything.com/home-exterior-tips/grease-stains-off-wood-deck/

https://www.youtube.com/watch?v=vgEHRsNU0ro

Here's a great post on removing grease from wood.