Fix Denoiser - don't throw it away
Denoiser seems to have been made obsolete with Premiere CC 13.1.1 - and within the Essential Sound Panel/Repair Section, Reduce noise has been made nonfunctional... presumably because Denoiser has gone away. This is a shame. Denoiser had problems when applied to clips (i.e., taking a few seconds at the beginning of each clip to take full effect) but you could work around it by applying it at the track level. This effect should be improved, not thrown in the trash bin.
Trent Happel commented
DeNoise and DeReverb audio effects are back in Premiere Pro 13.1.2 that was just released.
The 13.1.2 update for Premiere Pro includes two audio effects (DeNoise and DeReverb) that were missing in the Premiere Pro version 13.1.1 installer.