Filament cleaner for Replicator 2 4th gen

After having multiple failed prints lately I've decided to try a filament cleaner since I was observing small black dots in my prints. So I've tried a few on Thingiverse but I wasn't impressed.

This is my minimalist version of a cleaner and I've recycled some thing to wipe the table to put it in.

30 hours later not a single failed print.
And the spools are cooler too !

Edit: I forgot to mention to add a drop of oil on the fabric. I've used sunflower oil, but I guess any type of oil will work.