Measuring for a mitzvah - "מדידה של מצוה". Preferably should be done on "ערב שבת".
(Squeezing materials.) how to work with various types of brushes on Shabbos. (E.g., toothbrush, baby bottle brush, etc.);
Stuffing Up the Sink to Soak the Dishes. Wearing Rubber or Plastic Gloves. Pouring Hot Water onto Fats;