Check back in 15 minutes to verify that the water has not started fizzing and is clearer. It’s possible that the water is still glowing a bright blue or green. If so, it means that it’s still functioning.
Drain the sink once the fizzing stops, and the water color has faded. Use cool water to rinse the sink and then wipe it clean using a sponge or microfiber cloth.
This trick is great for guests who are visiting and need to quickly clean their bathroom sinks.