The Big Mac has been a fast food favorite for decades, and pretty much everyone knows the song. But while pretty much everyone has had a Big Mac, no one has been able to get just the secret sauce.

Until now.

Tomorrow, January 26th, four Grand Rapids stores will be giving away bottles of the special Mac sauce, as long as you know the secret code to tell an employee!

Tomorrow, if you tell a McDonald's crew member of special representative:

There's a Big Mac for that!

you will get a bottle of the special sauce! Of course, there are limited quantities of the goo available for you, so you need to get to the store before they're gone.

These are the stores in our area that will be giving away the special bottles:

  • 3814 Plainfield Ave. NE in Grand Rapids starting at 6:30 a.m.
  • 503 N. Lincoln Rd., Escabana starting at 11 a.m.
  • 30807 Woodward Ave. at 13 Mile Rd. in Royal Oak starting at 1 p.m.
  • 68889 M-62 in Edwardsburg starting at 1 p.m.

This is all to help promote the new Big Mac versions, the Mac Jr, and the Giant Mac.

Get your McDonald's secret sauce fix tomorrow, January 26th, before all the bottles are gone! There's no telling if they will ever give you access to the stuff again.

Get more details at MLive.com.