How to set illustration’s color mode to RGB

Sometimes Shutterstock rejects some of my illustration with this message:

Color Profiles – Your image contains both RGB and CMYK color profiles. Please resubmit your vector with only 1 color profile.

The problem is that I used (during the drawing of this illustration) some CMYK color – maybe I took if from some swatch, or I used part of some other illustration, which was in CMYK mode. It is quite easy to convert illustration back to one – RGB – color mode.

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