AI offers this...
"In current versions of WavePad, you can clean up crackles and similar artifacts by using:
Noise reduction tools under the Effects → Cleanup → Noise Reduction options (for background noise and some low‑level crackle).
Manual removal of obvious clicks/pops by zooming in and editing or attenuating those spots (often done via selection and basic edit tools).
If you specifically need an automatic “decrackle” processor like those in some dedicated restoration suites, WavePad does not label any of its effects that way, so you would either combine its noise reduction/cleanup tools or use a specialized restoration plugin or different editor alongside it."