I feel like im not doing this right at all.

Every time I find myself swapping the nozzles out the nozzle I take out ends up having hardened plastic so that I cant see clearly through it. To clear it I end up having to bathe it in weldon 4 which dissolves PLA but takes almost a day todo so.

My process for removing the nozzle consists of
Loosening the idler
Heating the nozzle up to 220
While it is heating slightly tugging on the filament until the heat fully allows it to release and pull out
Cool it down and unscrew nozzle

Is it normal to have solidified plastic in the hotend that will just ooze out when its reheated?