Check the POH for any particular aeroplane. However, I was taught (and use) the method ShyTorque advocates:
1) Throttle closed
2) Ailerons central
3) Full opposite rudder (check turn needle if in doubt as to direction)
4) Stick forward until spin stops
5) Centralise controls
6) Ease out of the dive.
Certainly works in Yak 52, Chipmunk, Cub, Super Cub, Citabria, and many others - at least in my experience, and for deliberate spins. The one unintentional spin I have been in was in the '52, and merely relaxing back pressure restored order (I'd flicked in the last quarter of a loop - pulling hard while out of balance
). A session with Genna later demonstrated to me the error of my ways, and how the '52 has a reliable tendency to do this with no warning if so mistreated.
The Chipmunk in particular might require full forward stick if the spin is prolonged, and it might also require a hard forward push past a 'false forward stop' caused by air loads on the elevator. But in a one or two turn spin, it comes out with no such drama.
SSD