One other thing with Wavepad. If you are using the trial program and your trial runs out. An old trick is to change the year on your system clock back to before you dled the program.
This doesn't work everytime, but I know when I set mine back to 2001 it works without a problem.
I usually shorten the MP3 I want down to about 20-30 seconds, then go to effects and run the DC offset Correction, High Pass filter set with the general audio cleanup, then finally the remove hum & hiss set with the normal remove hum & hiss. Finally I'll save it as a VBR MP3 between 32 & 64 with a 7 on the quality & channels set to stereo. That usually works. Some recordings you can only do so much with if the original is poor then the final will be poor. If you are recording the clip, do it at the highest quality setting first then go back and format it and save at the lower quality setting.