How do i get a grease stain out of concrete?

I used to use Tide laundry powder and a stiff push broom.

You might try Dawn since it breaks up petroleum.

You can try purple degreaser from the hardware store.

easy , , a bit of kerosene to disolve the stain , mop it up then spread concrete powder , leave for an hour then brush it up and no stain . Window clear can be used instead of kerosene .

Use google (because YA is gone in a few hours) this is a skill you will need going forward. Put this in the search- 'how to remove oil stains from concrete"

Result - https://www.concretenetwork.com/fix-concrete-clean...

Castrol super clean degreaser is the best i ever found.

Usually sold in auto parts stores and Ace hardware

An amazing grease remover is White wall tire cleaner. Around here I get Westleys  bleach white

There is a product called Gunk. You spray it on, leave it and hose it off. it dissolves oil and grease. I don't know what country you are in, but there will be similar products where you are. 

In emergency use washing up liquid/dish soap. Pour some on the concrete, without water, scrub with a stiff brush, and wash off. It works much better without water until after you scrub it. 

Try baking soda. Put a thick coat of it on the stain and let it sit for 30 minutes. Then use a wet nylon scrub brush and put dish soap on it. Scrub the baking soda with the brush until the stain is removed. Then rinse it off and let it dry. Hope that helps.