Get spanish friends and have them talk to you in spanish. You have to get some books or something to relearn all the words and learn conjugation etc...

but that is where most people lose their ability. Learning a language seems to only come around by speaking it. I have a handful of friends who have taken spanish and continually try to speak to me in spanish or tell me phrases. Start small. If people see you are trying to speak spanish most of them will appreciate it and coach you along.

Of course now that I know this information I now know I can switch to spanish and secretly talk about you...teeheee