Nozzle clean before printing

Hi,

is there a gcode that could clean the nozzle before starts printing?
I do have Gcode that prints a line before printing, but this is often not sufficient as the filament could lose from the bed and start to stick at the nozzle as a bubble. The bubble could get into the print especially when the nozzle turns into the direction where the bubble sticks.

I would like to have a script that does not just draw a line, it should print in all directions so that the bubble could fall off before the print starts.

Regards
testoli
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