Delete unused .cache/ukuu/<version>/amd/*.deb files during a remove/purge

[a-bentofreire]

ukuu version: 18.9
Desktop: Cinnamon 3.8.9 (Gtk 3.22.30) Distro: Linux Mint 19 Tara
Dual core Intel Core i5-6200U (-MT-MCP-) arch: Skylake rev.3

Is your feature request related to a problem? Please describe.
After using ukuu for a while a keep installing new kernel versions, the .cache/ukuu can reach several GB.
After some problem tracing I detected that ukuu downloads the kernels to the folder:
.cache/ukuu/<version>/amd/*.deb
And these files are never deleted.
These files, unlike the CHANGED/index.html/valid which are owned by the user, are owned by the root.

Describe the solution you'd like
During a remove/purge operation delete these files as well.