Remove the transmission fluid dipstick.

Using a flathead screwdriver, push in the black plastic tab of the dipstick and pull it out.

Using a clean rag, wipe the fluid off and then reinsert it. However, insert it backwards so that it doesn't lock again.

Pull the dipstick out again and verify that the fluid mark is at the second notch at the bottom of the dipstick.

Keep the dipstick out of the drain hole.