Grout in my vanity sink

I recently had a tiler work on my floor of my bathroom. As a calling card he left some of his grout in side the sink where he must of washed up making the surface feel as it has a bad case of acne he was nor using ordinary grout but eproxy we did not uses the sink foe a few days.
The sink is a vision brand polycarbonate vanity I have managed to remove 60% with a soap scourer rubbing very gentle, because if I damage I know I will be going into that "unhappy wife, unhappy life" and I do not want to go down that part of the world. Any ideas


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