Nice question friend, honestly i don't know much about hill station but i use audacity and it is perfect software to remove unwanted background sounds actually there are two ways to remove background noises from your tracks using audacity and i made video tutorials on both, i embedded both videos below,

Below is the video tutorial in which i tell how to remove background noise using noise reduction plugin.

Below is the video tutorial in which i tell more advance ways to remove background noise from your tracks using audacity.

Hope it helps.