I had some problems at first here and there but after reading a few post I decided to buy cleaning filament.
The one i’m Using now is from ESun and im really happy with it, Once in a while I run it through the printer.
First at 210 and run 100mm then I increase it to 10 degree lower then the max temp and run another 100mm through it. I let it cool then warm it up a bit to do a cold pulled.
Good for when you change type of filament and also some colour change.
I did notice after the first few mm of filament does not stick well but I now does a purge of filament before I start a new print after I use the cleaning filament.
It has worked for me very well so maybe it’s another option you can look into.