Which version of Cura are you running? This is included in Cura 2.6.69 but is not present in Cura 21.08.
In Cura 2.6.69 after switching to “custom” on the prepare tab, there will be a materials drop down section. Within that section, you will see a soften, wipe, and probe option. This is a feature that wasn’t present in our older version of Cura, and makes it a lot easier to adjust.
In Cura 21.08 you will need to manually change your start gcode. By going to advanced settings, than selecting the start gcode you can modify these lines:
M109 R160 ; soften filament for z homing
G28 Z ; home Z
M104 S150 ; wipe temp
By changing the M104 S150 -> M104 S185 you will increase your wiping temperature from 150c to 185c and should give you a cleaner nozzle for probing.