+1.If you're looking for that new string tone and don't want to buy new strings regularly, try soaking your strings for 24-48 hours in denatured alcohol.
The alcohol will clean your strings, removing the oils and gunk that dulls the sound, making them sound similar to how they sounded out of the package. They may not sound exactly the same, but close enough; they'll sound like pretty new strings, night and day compared to how they sound after they've been played for a three months. If the original sound of the strings when new was bright and zingy, this soaking will make them bright and zingy again.
Make sure the alcohol is denatured, otherwise it may have water content which could rust your strings. You can buy denatured alcohol at your local Home Depot, Lowe's, or (I imagine) any hardware store. I coil mine up and put them in a tupperware container, filled deep enough with denatured alcohol to immerse the strings.
Good luck!
How on earth did it take 30 responses to get to the answer?
I'm beginning to think the people surfing this forum have almost totally turned over in the last few years. This used to be a popular DIY. There was even a thing about making a long piece of PVC into a container for the soaking strings.