Sony Sound Forge Pro, at $375, is a professionally oriented Windows-based audio editing program which includes several functions that will reduce or eliminate tics, pops, crackles, rumble, and continuous surface noise.
I have used this program extensively, but not for those purposes. Once you get through a modest learning curve, it is fast, easy to use, stable, and powerful. The particular functions you would be using have a lot of flexibility in their settings that allow you to optimize the trade off of noise reduction vs. possible side effects. The program will not work miracles, but should allow you to improve your copies significantly.
They also offer a much cheaper consumer grade program which you will see on their website, but I don't think it includes the functions you would need.
The program was developed by a USA company named Sonic Foundry, btw, which was bought by Sony a few years ago.
Regards,
-- Al