Part #2.
Understanding the concept of "שכר שבת בהבלעה" (shabbos earnings included with weekday earnings).
is one allowed to use a plunger on Shabbos;
(Melting ice.) breaking the ice cubes to remove them from the ice tray; pouring hot liquids onto ice cubes (from a kli shieni);
When a Fly Is Between a Window and a Screen, Am I Allowed to Close the Window?;