Thanks everyone who has replied to my post.

Dry the area, make sure the bilge does not hold rainwater
and forget about it.

The bilge pump can remain dry without any problem. The pump itself is made
out of hard plastic, that is not impacted by being dry or wet.

Good. This means I am done with winterizing the bilge pump.

I definitely would not put any pink stuff in my bilge.

I have dried that area anyway and I have boat-cover over the boat to
prevent water from getting into the bilge area; therefore, there is no
need to put anti-freeze in it.

Jay Chan