Have in mind that generally there is no difference between spots and stains.Spot is a soluble substance which  can be removed with a simple and not so difficult treatment.Stain is the allready absorbed twin brother of the spot but it is allready dry and inside the carpet's fibres on its surface.You should clean the both -here there is no difference so there is no matter for you when you have to handle with them.

Remember some quick tips:

-always firts test the spotting fluid or the detergent you intent to use over your carpet;it happen to be dangerous for the carpet and to destroy its surface and fibres

-always apply water before and after the treatment;hot ot cold depends on the case and stains

-the treated area should dry as soon as possible

-and as we allready mentioned: use rubber gloves